Master Blasters (1990–1991)

Nash debuted in World Championship Wrestling (WCW) as the orange-mohawked "Steel", one half of the tag team known as the Master Blasters.^[6] He was initially partnered with Master Blaster Iron, with whom he made his debut at the Clash of the Champions XII on September 5, 1990, defeating Brad Armstrong and Tim Horner. At the following Worldwide taping on September 7, the Masters Blasters began a feud with Tim Horner and Mike Rotunda. They beat Horner and Rotunda on several house shows. On September 22, Nash's partner Master Blaster Iron was replaced by "Blade".^[6]

The reconstituted Master Blasters continued their undefeated streak in October. Meanwhile, Steel had his first singles match on September 28 by defeating Tom Zenk.^[19] At Halloween Havoc on October 27, 1990, the Blasters upended the Southern Boys and began to move up the WCW tag team ratings. Their winning streak ended on November 22, when Tom Zenk and Brian Pillman handed them their first defeat with Pillman pinning Blade. They rebounded to go on another undefeated streak by defeating the Southern Boys as well as Alan Iron Eagle and Tim Horner, and earning a NWA United States Tag Team Championship title shot against then champions the Steiner Brothers, but were defeated in two occasions.^[19] They were squashed on television in 52 seconds by the Steiners in a match that aired on Worldwide on February 2, 1991. Following this loss, their momentum dissipated as they lost to the Southern Boys and Ricky Morton and Tommy Rich, and they disbanded at the end of the month.

Nash was then rebranded as the Master Blaster in February 1991, who was pinned by Junkyard Dog on February 27.^[5] He also lost to Brian Pillman in house show matches, while appearing in tag team matches with Stan Hansen and Arn Anderson. His final match in this guise was against Pillman at a house show on May 12.

Oz (1991–1992)

A week later, Nash reappeared under his new gimmick, having been repackaged as the silver-haired Oz, a character based on the Wizard of Oz from the 1900 children's book The Wonderful Wizard of Oz.^[20] Oz, managed by The Great Wizard,^[20] was pushed strongly for about a month, he squashed several wrestlers before losing to Ron Simmons at The Great American Bash on July 14. In reality, all plans for Oz were immediately scrapped when Nash refused to sign a $300/night guarantee as WCW was cutting costs. A decision was made to retain Nash until a new gimmick could be developed. On October 27, he lost to Bill Kazmaier at Halloween Havoc. Nash wrestled as Oz throughout the remainder of 1991 and went on a lengthy losing streak, suffering defeats by Kazmaier, Rick Steiner, Dustin Rhodes, and Arachnaman.

He later used the gimmick for New Japan Pro Wrestling as the Great Oz in May 1992.^[21]

Vinnie Vegas (1992–1993)

On January 21, 1992, at Clash of the Champions XVIII, he was repackaged as Vinnie Vegas, a wisecracking pseudo-mobster based on Steve Martin's character in the 1990 film My Blue Heaven.^[22] Vegas was quickly recruited into "A Half-Ton of Holy Hell", a stable of large wrestlers created by Harley Race which included WCW World Champion Lex Luger, Big Van Vader and Mr. Hughes. The stable separated in February 1992 after Luger left, and Vegas joined the Diamond Mine, a stable led by Diamond Dallas Page that also included the Diamond Studd and Scotty Flamingo.^[8][23] In the summer of 1992, after Studd and Flamingo left the stable (Studd leaving for the WWF and Flamingo striking out on his own), Page and Vegas began teaming together as the Vegas Connection.^[8] The tag team split in late 1992 after Page was fired by Bill Watts.

Nash spent the first half of 1993 teaming with Big Sky. In June, he decided to depart for the World Wrestling Federation (WWF) and had his final WCW match on June 3, teaming with Big Sky in a losing effort against The Cole Twins, this match would air on Worldwide after his WWF debut.^[24]

Two Dudes with Attitudes (1993–1994)

Diesel in 1994

In June 1993, Nash left WCW, signing a contract with the WWF at the request of Shawn Michaels.^[25] He was given the stage name of "Big Daddy Cool Diesel" ("Diesel" or "Big Daddy Cool" for short), with an alpha-male gimmick. For the role, he grew long hair, taking on the appearance and demeanor of a cocky thug from Detroit, sporting black sunglasses and leather garments. The name of Diesel, suggested by Shane McMahon, was a play on the fact that Nash was from Detroit, known famously as the "Motor City". His initial entrance music was a series of truck engine and horn noises.

Diesel started out as the bodyguard/best friend of Shawn Michaels, with the two being known as Two Dudes with Attitudes. He made his WWF debut at a house show on June 6, 1993, by assisting Michaels in defeating Marty Jannetty for the WWF Intercontinental Championship.^[8] He first appeared on television the next night on Raw, June 7, as he was introduced as Michaels's bodyguard. In January 1994, Diesel appeared at the Royal Rumble, first as one of the many wrestlers who assisted WWF Champion Yokozuna in defeating The Undertaker in their casket match and then in the Royal Rumble match, eliminating seven men in under 18 minutes of in-ring time. Diesel won the Intercontinental Championship from Razor Ramon, following interference from Michaels on the April 30, 1994 episode (taped April 13, 1994) of Superstars.^[8][26] The duo of Diesel and Michaels defeated The Headshrinkers to win the WWF Tag Team Championship on August 28, making Nash a double champion.^[8][27] However, Diesel lost the Intercontinental Championship back to Ramon the following night at SummerSlam.^[8] The alliance between Diesel and Michaels dissolved after Survivor Series, when Michaels accidentally performed a superkick on Diesel. Diesel then chased Michaels, and despite failing to catch him, the reaction from the crowd turned him babyface. However, Nash was no longer a tag team champion, as Michaels' actions resulted in the team being forced to vacate the titles.

WWF Champion (1994–1995)

Nash (as Diesel) in 1994

On November 26, 1994, Diesel faced Bob Backlund for the WWF Championship he had won from Bret Hart three days prior at Survivor Series. In the match at Madison Square Garden, Diesel defeated Backlund in an eight-second squash.^[28] Diesel then promised Hart a match for his title, which they had the next month at the Royal Rumble. The match ended in a draw due to interference from several wrestlers, including Shawn Michaels. Michaels was irate about his former bodyguard having beaten him to the WWF Championship and was sufficiently motivated to win the Royal Rumble match later that evening, earning himself a title shot at WrestleMania XI.

At WrestleMania XI on April 2, Nash, accompanied to ringside by actress Pamela Anderson (who was supposed to valet for Michaels), defeated Michaels to retain the title. After the match, he left the ring with both Anderson and Michaels' replacement for her, Jenny McCarthy. The next night on Monday Night Raw, Michaels was betrayed by his new bodyguard, Sycho Sid, prompting Diesel to come to his rescue and thus reunited the tag team. Diesel successfully defended the WWF Championship against Sycho Sid at the inaugural In Your House pay-per-view on May 14, and at the In Your House 2: The Lumberjacks on July 23. At SummerSlam, Diesel retained the WWF Championship by defeating King Mabel, who had won the King of the Ring tournament.

On September 24 at In Your House 3 in Saginaw, Michigan, Diesel and Michaels challenged the reigning WWF Tag Team Champions Owen Hart and Yokozuna. The match had a winner-take-all stipulation, as in addition to the tag belts, Diesel's WWF Championship and Michaels' recently won Intercontinental Championship were also on the line. When Hart did not show up at the event, he was replaced by Davey Boy Smith. In the course of the match, Hart arrived at ringside, entered the ring and was pinned by Diesel for the win and the title, making him and Michaels holders of all three major WWF championships.^[27] The reign did not last long, however, as Hart and Yokozuna had the titles returned to them the next night on Raw due to Hart not being an official part of the match when he was pinned.

Diesel's WWF Championship reign continued until November 19, when he was defeated by Bret Hart at Survivor Series.^[8] Following the loss, Diesel attacked Hart.

Final feuds; departure (1995–1996)

At In Your House 5 in December 1995, Diesel defeated Owen Hart, who had injured Diesel's ally Shawn Michaels in a match the prior month. In January 1996, Diesel competed in the Royal Rumble, entering at number 22. Diesel was the last man to be eliminated from the Royal Rumble, being superkicked over the top rope by the winner, Shawn Michaels. Following the match, Diesel teased attacking Michaels before instead giving him a high five. Diesel went on to interfere in the main event between The Undertaker and WWF Champion Bret Hart, costing The Undertaker the title. At In Your House 6 on February 18, Diesel attempted to regain the WWF Championship from Hart in a steel cage match, losing after The Undertaker attacked him in retaliation for his actions at the Royal Rumble.^[8]

Shortly before WrestleMania XII, Nash's contract status was in a state of flux. At the time, WCW was offering large amounts of money to the WWF's talent by Eric Bischoff, WCW Executive Vice President, to jump ship. In fact, Bischoff had succeeded in convincing several high-profile WWF stars to sign with WCW over the previous two years, including five-time former WWF Champion Hulk Hogan and his on-again, off-again friend and two-time former WWF Champion Randy Savage, and was in the process at the time of talking to Nash's friend Scott "Razor Ramon" Hall about a contract as Hall's too was set to expire. Nash explained on the WWE Classics on Demand exclusive series Legends of Wrestling that Hall had been the first to sign with the company and was offered a contract that paid him "above Sting money" (at the time, Sting was one of the highest paid wrestlers in the company and although Ric Flair, Hulk Hogan, and Randy Savage had been making more, Sting's contract was used as a measuring stick). Hall also informed Nash that he had been given "most favored nation" status, which meant that if someone new was hired for more money, Hall's contract would increase to match that contract. Bischoff ended up offering Nash a three-year guaranteed contract with a $1.2 million annual salary. Nash said to Vince McMahon that he did not want to leave the WWF and that if McMahon was willing to match the offer, he would stay. McMahon said no because, according to Nash, he would have had to offer matching contracts to other wrestlers and with the promotion in a bad financial situation, he simply could not afford it. Nash signed his contract shortly thereafter.

Diesel lost to The Undertaker at WrestleMania XII on March 31, after which he finally turned heel and went on to feud with Shawn Michaels once again after he turned on him at a Madison Square Garden live event. In his last televised WWF appearance until 2002, Diesel challenged Michaels for the WWF Championship (which he had won from Hart at WrestleMania XII) at In Your House: Good Friends, Better Enemies on April 28. He wrestled Michaels for the title once again in a steel cage match at a house show on May 19, but was again defeated.^[29] After the match, Diesel, Michaels, Razor Ramon and Hunter Hearst Helmsley, a group of off-screen friends known collectively as "The Kliq", hugged one another in the ring and wished each other farewell.^[29] This incident, later referred to as the "Curtain Call" or "MSG Incident", was a serious breach of character, as it showed heels and babyfaces consorting with one another.^[30] Shortly thereafter, with his obligations to the WWF now completely fulfilled, Nash left for WCW.^[29]

New World Order (1996–1999)

Nash, Scott Hall and Sean Waltman called themselves "The Wolfpac" and made hand gestures the crowd is seen giving Nash here.

After two weeks of Scott Hall returning on WCW programming and taunting announcers, wrestlers, and the company, Nash also returned alongside his friend on June 10, 1996, after Hall interrupted Eric Bischoff. The duo were known as The Outsiders, and the storyline originally pushed them as "invaders" from the WWF (which WCW eventually had to scale back due to legal concerns from the WWF). At Bash at the Beach, Hall and Nash fought the team of Lex Luger, Sting, and Randy Savage and promised to add one more man to their entourage. After Luger was taken out of the match, Hulk Hogan came out to make the save, only to turn on Savage and reveal himself as Nash and Hall's third man. Immediately after this, they began cutting promos calling themselves the New World Order (nWo). During his return, he had dyed his hair blonde. Through late 1996 and into 1997, Nash normally teamed with Hall as the Outsiders, and they held the WCW World Tag Team Championship.^[8] Nash also began to show his leadership qualities in the nWo, and became a sort of "second in command" alongside Hogan. Nash, Hall, and Sean Waltman distinguished themselves from the rest of the nWo, calling themselves the "Wolfpac" in 1997.^[8]

After a while, however, the nWo began to fight within its ranks, with Hogan and Nash battling for control. The situation came to a head on April 20, 1998, during a match between Hogan and recent nWo inductee (and rival) Randy Savage for Savage's recently won WCW World Heavyweight Championship. During the match, Nash interfered on Savage's behalf and jackknifed Hogan to the mat, signaling the breakup of the nWo into two separate factions (Nash's interference was not enough to prevent Hogan from regaining his championship, thanks to Bret Hart's interference shortly thereafter). Nash became the leader of nWo Wolfpac, alongside Savage, Curt Hennig, and Konnan. Hennig, however, shortly thereafter defected over to Hogan's nWo Hollywood faction. Then, during a match between Hall, Nash, Sting and The Giant (who had recently rejoined the nWo after being kicked out two years prior), Hall turned on Nash by hitting him with his tag team title belt and leaving the ring. The Wolfpac, however, was not down for long as Lex Luger joined Nash's team. Sting would eventually become a member as well, after being recruited heavily by both sides towards the middle of 1998. After Sting won Giant's half of the tag team title at the Great American Bash that June, Nash became Sting's partner.^[8] They defended the championship until July 20, when they were defeated by Hall and The Giant. Nash then set his sights on his former partner, and the rivalry came to a head at Halloween Havoc on October 25. During the course of the match, Nash jackknifed Hall twice but, instead of pinning him, left the ring and lost via countout. In November 1998, Nash and Diamond Dallas Page became a part of a loosely organised "creative team" which also included Dusty Rhodes and Kevin Sullivan.^[31]

The following month at World War 3, Nash entered the 60-man, three ring battle royal that was a staple of the pay-per-view, with the winner getting a shot at the WCW World Heavyweight Championship at Starrcade the following month. Nash survived to the end after literally clearing his ring out and big booting Lex Luger, who had Scott Hall in the Torture Rack, over the top rope, and earned his shot at the title. At Starrcade, Nash won the WCW World Heavyweight Championship from Goldberg (who had an officially given 173–0 win–loss record before the match) after Scott Hall shocked Goldberg with a stun gun.^[8][32] In doing so, Nash broke Goldberg's long running undefeated streak.^[8] On January 4, 1999, Nash and Goldberg were set to meet in a rematch, but the match did not happen because of Goldberg being arrested for stalking Miss Elizabeth. That night also marked the return of Hulk Hogan after his "retirement" two months prior. With Goldberg unable to wrestle, Nash challenged Hogan instead. Hogan simply poked Nash in the chest, who proceeded to fall down and willingly allow Hogan to pin him for the title.^[8] The gesture marked the reunion of the feuding nWo factions into one.^[8] The return, however, was short-lived, and by May 1999, the nWo reunion was over due to injuries to Hogan, Hall, Luger and Steiner.^[8] Meanwhile, backstage, Nash became WCW's head booker in February 1999 and helped write some of the later angles for WCW.

WCW World Heavyweight Champion (1999–2001)

Nash in the ring with Sting, who he would later join forces with after the formation of the nWo Wolfpac

In May 1999, Nash won the WCW World Heavyweight Championship for the second time by defeating Diamond Dallas Page at Slamboree.^[8][32] He then appeared on The Tonight Show and put up a $250,000 challenge to Bret Hart for its May 24 program. However, Bret's brother, Owen, died in a wrestling stunt just as Bret was flying to Los Angeles; this immediately canceled their match and the feud. Nash then entered a feud with the returning Randy Savage, who was later joined by a returning Sid Vicious at The Great American Bash in June when he powerbombed Nash during the match, thus giving Nash a disqualification victory (as the signature move of both men, the Jackknife Powerbomb, had been ruled an "illegal" move by WCW leadership due to its high potential for injury). This rivalry culminated in a tag team match at Bash at the Beach in July 1999 which pitted Nash and Sting against Savage and Sid. A stipulation was added that whoever got the pin in the match would become WCW World Heavyweight Champion. Nash was pinned by Savage and lost his championship, but would get his revenge the next night on Nitro in a title match between Savage and a returning Hulk Hogan, and in a similar situation to Savage's first title defense from the previous year, he used a Jackknife Powerbomb on Savage, preserving the victory for Hogan. The following week, however, Nash attacked Hogan during a match pitting Hogan against Vicious. Nash, Sid, and Rick Steiner then feuded with Hogan, Sting, and a returning Goldberg until Road Wild, where Hogan defeated Nash in a "retirement" match.^[8]

On October 4, 1999, Nash returned to WCW along with Scott Hall, which was later revealed to be a new version of the nWo involving Nash, Hall, Bret Hart, and Jeff Jarrett called 'nWo 2000'. This would not last long either due to the injury of Hart, and Nash spent most of 2000 feuding with the likes of Terry Funk, Mike Awesome, Scott Steiner, and Booker T.

Nash won the WCW World Heavyweight Championship again from Booker T on the August 28, 2000 episode of Monday Nitro in Las Cruces, New Mexico.^[32] He eventually lost it to Booker T later on at Fall Brawl. He even had a stint as WCW Commissioner,^[8] and he served as a coach/mentor to the Natural Born Thrillers, who would eventually turn on Nash. Nash aligned himself with Diamond Dallas Page, reuniting the Vegas Connection, but renamed the Insiders. They feuded with the Perfect Event (Shawn Stasiak and Chuck Palumbo) and won the WCW World Tag Team Championship at Mayhem on November 26, 2000.^[33][34] Shortly after, they were stripped of the title by Commissioner Mike Sanders in mid-December. Weeks later, they won the title back at Starrcade.^[35][36] In 2001 (WCW's final months), the Insiders continued their feud with the Natural Born Thrillers. Nash lost another "retirement" match to Scott Steiner at SuperBrawl Revenge,^[8] but it would not be long before WCW announced the sale of the company to the World Wrestling Federation. As he had a guaranteed contract with AOL Time Warner, Nash elected to wait out the remainder of his contract, which expired on December 31, 2001.

New World Order reunion (2002)

Following the expiration of his AOL Time Warner contract, Nash, along with Scott Hall and Hulk Hogan, were rehired by the WWF.^[8] Their rehiring was announced several weeks before their debut, with Vince McMahon claiming to have hired the nWo in order to destroy the WWF – of which Ric Flair was now a co-owner, which McMahon could not tolerate. Billed as the original nWo, Nash, Hall, and Hogan returned to the WWF at No Way Out on February 17, 2002. In the course of the evening, the nWo delivered an interview in which they claimed to have reformed, gave a six pack of beer to Stone Cold Steve Austin (which he refused), and traded insults with The Rock. They interfered in the main event of the evening, helping Chris Jericho retain his Undisputed WWF Championship against Austin. At WrestleMania X8, Nash continually interfered in the match between Hall and Austin to the point where he was forced to return backstage. Later that night, he and Hall turned on Hogan after he had offered congratulations to The Rock for defeating him. In March, Nash suffered a biceps injury that put him out of action for several weeks and almost immediately upon returning, suffered a quadriceps tear in a tag match on the July 8 episode of Raw.^[8] On the July 15 episode of Raw, the nWo was officially disbanded by Vince McMahon as Eric Bischoff became Raw general manager.

Feud with Triple H (2003)

After a nine-month injury, Nash returned as a face on the April 7, 2003 episode of Raw, much to the delight of both Shawn Michaels and Triple H, who were feuding with each other when Nash returned. As part of the storyline, Nash was given a choice to remain friends with either Michaels or Triple H. After Nash would not make the decision, Triple H made the decision for him and turned on him with a low blow. This led to Nash and Triple H feuding with one another. Nash teamed up with Michaels and Booker T against Triple H, Ric Flair and Chris Jericho in a six-man tag team match at Backlash which ended with Triple H picking up the win for his team, pinning Nash after hitting him with a sledgehammer. Following Backlash, Nash was granted a shot at Triple H's World Heavyweight Championship, and the two squared off at Judgment Day with Michaels and Flair in their respective corners. Triple H would get himself disqualified and kept the title as a result, but this did not stop Nash from attacking Triple H following the match, putting him through the announcer's table with a Jackknife Powerbomb. The next month, they fought again in a Hell in a Cell match at Bad Blood with Mick Foley as the special guest referee, but Nash lost the match.^[8]

In August 2003, Nash feuded with Chris Jericho and was forced to cut his hair after losing a hair vs. hair match against Jericho on the August 18 episode of Raw. This was made to cover Nash having to cut his hair for his role as The Russian for the 2004 Punisher film. His last match in WWE was at SummerSlam in an Elimination Chamber match for the World Heavyweight Championship against Triple H, Shawn Michaels, Goldberg, Chris Jericho, and Randy Orton.^[8] He was the first to be eliminated after Jericho pinned him following Sweet Chin Music from Michaels. Before leaving, however, he executed a Jackknife Powerbomb on Jericho and Orton. Nash then stepped away from in-ring action and underwent neck surgery.^[8]

Kings of Wrestling (2004–2005)

Nash debuted in Total Nonstop Action Wrestling alongside the returning Scott Hall on November 7, 2004, at the inaugural monthly TNA pay-per-view, Victory Road, with the duo helping NWA World Heavyweight Champion Jeff Jarrett retain his title in a ladder match with Jeff Hardy.^[8] In subsequent weeks, the trio identified themselves as the Kings of Wrestling and began feuding with Hardy and A.J. Styles. At Turning Point on December 5, the Kings of Wrestling were defeated by Hardy, Styles, and Randy Savage.

Hall left TNA in early 2005, and Nash and Jarrett separated after Nash made clear his desire to win the NWA World Heavyweight Championship. Nash received a title shot against Jarrett on February 13, 2005, at Against All Odds, but lost following interference from the debuting Outlaw.^[8] Following the defeat, Nash joined forces with Sean Waltman and began feuding with the newly formed Planet Jarrett. At Destination X on March 13, Nash lost to The Outlaw in a First Blood match following interference from Jarrett, who struck Nash with his title belt. The rivalry between Planet Jarrett and Nash and his allies culminated in a scheduled Lethal Lockdown match at Lockdown on April 24 pitting Nash, Waltman, and Diamond Dallas Page against Jarrett, The Outlaw, and "The Alpha Male" Monty Brown. Nash, however, was removed from the card and replaced with B.G. James after contracting a staph infection, which left him sidelined for much of 2005.

Nash returned to TNA on October 1 for the first episode of Impact! on Spike TV,^[8] attacking and powerbombing Jarrett. Nash went on to challenge Jarrett to a match for the NWA World Heavyweight Championship at Bound for Glory on October 23. In the weeks preceding the event, Nash and Jarrett had several heated confrontations, on one occasion brawling with one another and with guest referee Tito Ortiz. On October 22, one day before Bound for Glory, Nash was hospitalized with chest pains. At Bound for Glory, a battle royal was held to determine the number one contender; Rhino won and then defeated Jarrett for the NWA World Heavyweight Championship. Nash was later discharged from the hospital, having suffered a mild cardiac episode. He made a partial return to the ring in December 2005, wrestling several matches on a tour of South Africa.

Paparazzi Productions (2006–2007)

Nash in TNA in 2008

Nash returned to TNA once more on the April 27, 2006 episode of Impact!, announcing in a pre-taped segment that he would give a private interview to Alex Shelley one week later. The interview saw Nash claim to be the most profitable WWF World Heavyweight Champion of all time and describe the X Division as "basically filler". Nash went on to announce that he intended to destroy the X Division in order to reassert his position within TNA. He began his campaign at Sacrifice on May 14, powerbombing Puma and continued his campaign on the May 19 episode of Impact! by attacking Chris Sabin shortly after he had defeated Petey Williams to win the TNA 2006 World X Cup Tournament for Team USA. Nash continued to attack X Division wrestlers over subsequent weeks, leading to Sabin challenging him to a match at Slammiversary. Nash's attacks were also coupled with pre-taped segments with Shelley (some appearing only on the internet website YouTube) and his "X Division debut" on the June 15 episode of Impact!, where Nash wrestled a comedy match against a midget Shelley dubbed a "Sabin-type wrestler". Nash defeated Sabin at Slammiversary in his second televised match in almost a year, albeit with the assistance of Shelley.

Around this time, Nash and Shelley formed a stable known as Paparazzi Productions, with Johnny Devine as a cameraman. Nash then decided to go for the X Division championship. He got penciled into a Number One Contendership match for the title against Sabin at Hard Justice. He claimed that he had developed an 840° somersault splash that he would unveil in the match. However, over the weekend, he suffered a mysterious neck injury, supposedly while practicing it with Tito Ortiz, and named Alex Shelley as his replacement in the match. From a wheelchair, Nash was helpless as he watched Shelley lose the match to Sabin. Nash remained out of action due to the injury, but returned prior to Bound for Glory, and announced The Kevin Nash Open Invitational X Division Gauntlet Battle Royal. Austin Starr won the match. Nash took an interest in Starr, which seemed to be at the behest of Shelley. Nash then worked with the X Division stars in a weekly segment known as the Paparazzi Championship Series (a play on the "Bowl Championship Series"). He also began continuing these skits along with Sonjay Dutt and Jay Lethal, in a segment called "Paparazzi Idol". Nash became a manager of sorts for Lethal, helping him adopt a gimmick where he impersonated "Macho Man" Randy Savage. At Sacrifice, Lethal and Dutt had an altercation. Nash broke it up, but Sonjay kicked him. Sonjay apologized, and Nash forgave him. Dutt then became the Guru with Nash humming mantras backstage.

He then began managing The Motor City Machine Guns, but this was short-lived before he next appeared in the role of Dr. Nash, psychiatrist and adviser to Kurt and Karen Angle. Nash then engaged in a brief program with TNA Heavyweight Champion Kurt Angle, which eventually culminated in Nash aiding Angle. Nash warned the Angles about how dangerous Sting can be based on Nash's experience feuding with Sting in WCW. At Bound for Glory, Nash interfered on Angle's behalf during his World Title defense against Sting. However, it was for naught, as Sting captured the title from Angle via Scorpion Death Drop after fending off Nash and Angle's wife, Karen. The following Thursday on Impact!, Nash and Angle had an altercation because Angle blamed Nash for him losing the World Title. Angle eventually attacked Nash, who retaliated by Jackknife Powerbombing Angle in the middle of the ring. The following week, Sting defended the TNA World Title against Angle in a rematch from Bound for Glory, and Nash had a ringside seat. After the match went on a bit, Angle and Sting were out of the ring and when Angle pushed Sting onto Nash, Sting turned around and hit Nash in the face with a right hand shot, leading to Nash interfering on Angle's behalf, even though earlier he said he was not going to help Angle. Following the match, which Angle won, Nash offered a hand shake to Angle only to be "flipped off" by the new champ. An enraged Nash demanded a match with Angle, but TNA Management's public face, Jim Cornette, instead booked Nash into a tag team match as Angle's partner against Sting and a partner of his choosing, with the stipulation being that the person gaining the pinfall or submission would be crowned the new TNA World Heavyweight Champion. After a red herring that Scott Hall was the mystery partner, it was revealed to be Booker T.

The Main Event Mafia (2008–2009)

Nash with The Main Event Mafia

At Final Resolution, Nash and his partner Samoa Joe lost in a title match to TNA World Tag Team Champions A.J. Styles and Tomko after Nash abandoned and seemingly betrayed Joe. Yet on the following Impact, when Joe stormed into Nash's locker room looking for a fight, Nash was actually able to persuade Joe into accepting his Machiavellian mentorship. Nash lost to Kurt Angle in a one-on-one match on Impact! with the winner qualifying for the Three Ways to Glory match at No Surrender. On the September 11 episode of Impact, prior to No Surrender, he seemingly parted ways with Joe on good terms. One month later, Nash returned at Bound for Glory IV and in a swerve, struck Joe in the back with Sting's bat, helping Sting win the TNA World Heavyweight Championship, turning heel once again in the process. On October 23, he formally joined Sting, Booker T, Scott Steiner, and Kurt Angle to create a villainous stable called The Main Event Mafia. He explained that he never forgave Joe for his scathing comments directed at his best friend Scott Hall's no-show almost a year prior, and befriending him was all part of a long-term plan to screw him out of the title. He then went on to defeat Joe at Turning Point. Nash, however, was removed from the card for Genesis due to a staph infection, and was replaced by Cute Kip. Nash returned on the January 29 episode of Impact! when the Main Event Mafia took over the show. On Impact! on April 23, he began an on-screen relationship with Jenna Morasca, who subsequently began acting as his valet. At Slammiversary, he was reunited with Joe and helped Angle win the World Heavyweight Championship.

At Victory Road, Nash defeated A.J. Styles for the Legends Championship, his first title in TNA.^[37] However, Nash lost the title only three days later to Mick Foley.^[38][39] Under a month later at Hard Justice, Nash defeated Foley to reclaim the Legends Title.^[40][41] At Bound for Glory Nash lost the Legends Title to Eric Young in a 3-way match, which also included Hernandez.^[42]

On the following episode of Impact!, after Angle announced the death of The Main Event Mafia and turned face, Nash also became a face as he began feuding with Eric Young and the World Elite.^[43] However, the following month at Turning Point Nash helped World Elite members Doug Williams and Brutus Magnus retain their TNA World Tag Team Championship.^[44] On the following episode of Impact! Nash congratulated Young on outsmarting him at Bound for Glory and aligned himself with the World Elite, while also hinting at the return of the nWo once Hulk Hogan arrived in TNA, as when a paranoid Mick Foley came to him for information on who Hogan would be coming with, he facetiously suggested names such as Syxx-Pac, Scott Steiner, Buff Bagwell, and Scott Hall. Further suspicion was aroused to Hall's return when Nash said that he was getting "the band" back together, hinting at an nWo return.^[45] At Final Resolution Nash took part in the "Feast or Fired" match and won the briefcase containing a shot at the TNA World Tag Team Championship.^[46]

The Band (2010–2011)

On the January 4, 2010, special live, three-hour Monday night edition of Impact! Hogan made his debut in TNA, and Scott Hall and Sean Waltman made their return to the company to greet him. Nash, Hall and Waltman quickly reformed their alliance, but Hogan kept himself out of the group, claiming that times have changed.^[47] At Genesis in their first match back together Nash and Syxx-Pac, who replaced Scott Hall in the match, were defeated by Beer Money, Inc.^[48] On the February 4 episode of Impact!, Hall and Syxx-Pac turned on Nash.^[49] At Destination X Nash and Young faced Hall and Syxx-Pac in a tag team match, where The Band's TNA futures were on the line. Nash turned on Young and helped the Band pick up the victory, which finally gave them contracts with the company.^[50] On the March 29 episode of Impact!, Nash offered Young a spot in the Band, claiming that what happened in Destination X was just business and nothing personal. Young refused the offer and in the main event of the evening, teamed up with Rob Van Dam and Jeff Hardy to defeat the Band in a six-man tag team steel cage match.^[51] Nash gained a measure of revenge on Young by defeating him in a steel cage match at Lockdown. Later in the night, Nash replaced Syxx-Pac, who no-showed the event, and teamed up with Hall in a St. Louis Street Fight, where they were defeated by Team 3D.^[52] On the May 3 episode of Impact!, Eric Young turned on Team 3D and joined The Band.^[53] On May 4, at the tapings of the May 13 episode of Impact!, after TNA World Tag Team Champion Matt Morgan had been attacked by Samoa Joe, Nash cashed in his "Feast or Fired" contract, teaming with Hall, and pinned him to win the TNA World Tag Team Championship.^[54] Nash later named Young one third of the champions under the Freebird Rule.^[55][56] At the June 14 tapings of the June 17 episode of Impact!, The Band was stripped of the Tag Team Championship, due to Scott Hall's legal problems.^[57][58] The following day it was reported that Hall had been released from his contract with TNA.^[59] On the June 24 episode of Impact!, Nash and Young decided to part ways, as Nash intended to go after Hogan, whom he blamed for what had happened to Hall and Waltman, and did not want Young to get into trouble for it.^[60][61]

After Nash was unable to convince Hogan to re–hire Hall and Waltman and failed to secure a meeting with Eric Bischoff, he set his sights on renewing his feud with Jeff Jarrett, who claimed that Nash had tried to hurt TNA by bringing Hall and Waltman in.^[62][63][64] On the August 5 episode of Impact!, Sting, who had feuded with Jarrett prior to his 30-day suspension, returned to TNA and, together with Nash, beat down Jarrett, Bischoff and Hogan.^[65] On the August 26 episode of Impact!, Nash defeated Jarrett in a singles match, after an interference from Sting.^[66] The following week Nash helped Sting defeat Jarrett. After the match Samoa Joe aligned himself with Jarrett and Hogan and drove Nash and Sting away.^[67] At No Surrender Jarrett and Joe defeated Nash and Sting in a tag team match, after Jarrett hit Sting with a baseball bat.^[68] On the September 16 episode of Reaction, Nash and Sting were joined by D'Angelo Dinero,^[69] who claimed to have gotten inside information from Bischoff's secretary Miss Tessmacher, that would suggest that Nash and Sting were right about Hogan and Bischoff being up to something.^[70] At Bound for Glory Nash, Sting and Dinero faced Jeff Jarrett and Samoa Joe in a handicap match, after Hulk Hogan, who was scheduled to team with Jarrett and Joe, was forced to pull out due to back surgery. At the end of the match Jarrett abandoned Joe and left him to be pinned by Nash. At the end of the event it was revealed that Nash and Sting had been right about Hogan and Bischoff all along, as they aligned themselves with Jarrett, Abyss and Jeff Hardy.^[71] On October 13, 2010, Nash's contract with TNA expired and he announced his retirement from professional wrestling.^[72][73] His last TNA appearance was a taped broadcast on October 14, 2010, when Nash and Sting both announced they were walking away from TNA rather than being a part of Hogan and Bischoff's regime.^[74] In January 2011 Nash signed a new contract with TNA, but was granted a release before reappearing on television, after being contacted by WWE.^[75]

Feuds with CM Punk and Triple H (2011–2012)

On January 30, 2011, at the Royal Rumble, Nash, billed as Diesel for the first time since 1996, returned to the promotion, taking part in the Royal Rumble Match. He entered the match at number 32, but was eliminated by Wade Barrett.^[82] It was announced that he had signed a five-year WWE Legends contract.^[83] On April 2, Nash, along with Sean Waltman, was on hand to celebrate the induction of Shawn Michaels into the WWE Hall of Fame class of 2011. Triple H inducted Michaels, and after Michaels gave his speech, Nash and Waltman joined the two on stage to celebrate.^[84]

Nash entering the ring in November 2011

Nash, no longer billed as Diesel, returned at SummerSlam in August, attacking CM Punk after he became WWE Champion, which allowed Alberto Del Rio to cash in his Money in the Bank briefcase and win the title, thus turning heel. The following night on Raw, Nash claimed Triple H, on-screen chief operating officer of WWE, had instructed him by text to attack the winner. Punk verbally berated Nash on the microphone,^[85] so Nash attacked him the next week. He also distracted Punk in a match, making him miss out on a championship match. Nash was signed to an on-screen contract the next week by John Laurinaitis and demanded a match against Punk. After Triple H booked himself in the match against Punk instead, Nash attacked them both at a contract signing and was fired on screen.^[86] At Night of Champions, Nash interfered in their match, alongside The Miz and R-Truth. Triple H then attacked Nash with a sledgehammer before winning the match.^[87] Nash returned at the following pay-per-view, Vengeance to help Miz and Truth defeat Punk and Triple H. After the match, he attacked Triple H with a Jackknife Powerbomb and attacked him again the following night with his sledgehammer, preventing him from receiving medical attention and taking him off television. The following Monday, on October 31, Laurinaitis again signed Nash to a new contract. He continued to appear on Raw, attacking Santino Marella with a Jackknife Powerbomb and cutting promos about how Triple H was more of a boss than a friend. On the December 5 episode of Raw, Nash competed in his first televised WWE match in eight years, defeating Santino Marella.^[88] Nash went on to face Triple H at TLC: Tables, Ladders and Chairs in a ladder match with a sledgehammer hanging above the ring which he lost by pinfall after a sledgehammer shot to the face, ending the feud in the process.^[89]

Sporadic appearances and WWE Hall of Famer (2012–present)

In late 2012 and early 2013, Nash began appearing on WWE's developmental training show, NXT. Nash initially appeared as the guest Match Commissioner for the night, a title given to him at the request of Dusty Rhodes. After announcing this to the crowd, Nash was interrupted by Heath Slater to whom he promptly delivered his finisher, effectively turning face. Nash later again appear on the January 20th tapings of NXT to reunite with members of The Kliq, allowing him to effectively settle all issues with Triple H, embracing him once again. The reunion also turned into a reunion of D-Generation-X and Nash was awarded the title of being an honorary member of the stable. Nash then helped DX take down Damien Sandow.^[90]

Nash competed in the 2014 Royal Rumble match as the 14th entrant, eliminating Jack Swagger before being eliminated by Roman Reigns. He inducted his real-life close friend and former tag team partner, Scott Hall, into the WWE Hall of Fame class of 2014. Nash appeared on the August 11 episode of Raw to reunite the nWo with Hulk Hogan and Scott Hall as part of Hogan's birthday celebration. Nash was suspended by WWE on December 24, 2014, following his arrest, but was quickly reinstated when the charges were dropped.^[91]

Nash (left) at WrestleMania 31 in 2015, alongside Hulk Hogan (middle) and Scott Hall, as the nWo

On the January 19, 2015 episode of Raw, Nash appeared with X-Pac and Scott Hall to reunite the nWo, and along with The Acolytes Protection Agency and The New Age Outlaws, they beat down The Ascension, who had been insulting legends from past weeks.^[92] On March 23, 2015, it was announced that Nash would be inducted into the WWE Hall of Fame class of 2015. On March 28, he was inducted by long-time friend and Kliq member, Shawn Michaels. On March 29, Nash appeared at WrestleMania 31 alongside Hulk Hogan and Scott Hall, in their attempt to even the odds in favor of Sting in his match against Triple H, who had D-Generation X (Billy Gunn, Road Dogg, Shawn Michaels, and X-Pac) in his corner. However, Sting lost the match after Triple H hit him with a sledgehammer as he was attempting a Stinger splash.^[93]

Nash made a return to WWE for the Raw Reunion show on July 22, 2019.^[94] On December 9, 2019, it was announced that Nash would be inducted into the WWE Hall of Fame (2020 Class) for a second time as a member of nWo, together with Hogan, Hall, and Sean Waltman.^[10]