On their way home from the movie theater, Shaggy and Scooby-Doo discover a black suit of armor in an abandoned pickup truck. The gang delivers it to the local museum. Later that night, they break into the museum to search for some clues, after learning that the archaeologist transporting the suit is missing. They find out that the black knight's armor comes to life by the light of a full moon. They unmask the Black Knight, revealing him to be none other than Mr. Wickles, the corrupt museum curator.

• Don Messick (the voice of Scooby Doo), in the episode, also voices: Mr. Wickles, Prof. Hyde White, and The Sheriff
• Guest Voice: John Stephenson as The Black Knight and The Museum Worker

The gang's beach party gets interrupted by the ghost in a glowing deep sea-diving suit, who they think is connected with the disappearance of several yachts. This mystery leads them underwater, to an area known as "The Graveyard of Ships" where they again run into the ghost.

• Don Messick also voices Ebenezer Shark and the Mouse
• Guest Voice: Jean Vander Pyl as Widow Cutler

The Mystery Inc. gang goes on a boating excursion, but they get lost in a fog and crash their boat on the mysterious Haunted Isle. They decide to venture to the abandoned Vázquez Castle on the island to seek help. But instead, they encounter a transparent phantom running around loose, who warns them to leave the island and never return.

• Don Messick also voices: The Phantom, Bluestone the Great, and the police officer

Thanks to Shaggy reading the map upside-down, the sleuths end up at Gold City, an old mining town in the California desert. They meet Hank the Caretaker, who tells them that it's haunted by a miner from 1849, who is said to wander the mine shaft looking for the last vein of gold. The gang manages to discover all the clues and eventually finds the real ghost, revealing him to be none other than Hank.

• Don Messick also voices Hank and the mouse
• Casey Kasem (the voice of Shaggy) also voices the Miner 49er
• Frank Welker (the voice of Fred) also voices the vulture
• Guest Voice: Hal Smith as Big Ben

When a series of local dognappings alarms prize-winning animal trainer Buck Masters, the Mystery Inc. gang offers to have Scooby pose as a decoy to catch the dognapper. However, their plan backfires as Scooby is himself dognapped, leading the gang to find out that the dognapper appears to be under the command of a vengeful Indian witch doctor. The gang then rescues Scooby and all the other dogs, unmasking the ghost and revealing him to be none other than Buck Masters. Notes:

• Don Messick also voices The Radio Broadcaster, Buck Masters, The Indian Witch Doctor, and The Sheriff
• Casey Kasem also voices Mike
• Frank Welker also voices Charlie
• Jean Vander Pyl voices a dog owner
• Barry Richards voices Geronimo

The gang pays a visit to their friend Sharon Wetherby, whose Uncle Stuart is cursed by the ghost of Elias Kingston. When Uncle Stuart disappears completely, the gang ventures into the abandoned and allegedly haunted Kingston Mansion next door, in search of him and Elias. Notes:

• Don Messick also voices Mr. Wetherby and the Bulldog
• In addition to her role of Daphne, Stefanianna Christopherson also voices Sharon
• Jean Vander Pyl voices the swami customer
• Stuart and The Ghost of Elias Kingston were voiced by John Stephenson

The gang get their jobs as extras on the set of a new motion picture entitled The Ape Man of Forbidden Mountain. Directed by Daphne's Uncle John, this feature film is based on the legend of an ape-man. However, the legend soon becomes reality; and the ape man terrorizes the set. Notes:

• Don Messick also voices Mr. Maxwell and the parrot
• Vic Perrin voices Carl and the Ape Man
• Jean Vander Pyle voices Candy

Mystery, Inc. notices that the seaside amusement park appears to be operating automatically, so they decide to investigate. They soon discover that a crazy-looking robot named Charlie is wreaking havoc. However, when they notify Mr. Jenkins, he and his jealous sister rebuff them, convincing the teens to solve the mystery themselves. The gang finds the real culprit behind the scheme and reveals it to be none other than Sarah, the caretaker's jealous sister. Charlie is back to normal and the gang reunites the caretaker.

• Don Messick also voices Mr. Jenkins
• Guest Voice: Jean Vander Pyle as Sarah Jenkins

While taking home some leftovers from a pizza parlor, Shaggy and Scooby-Doo come across a violin case filled with counterfeit money. While Scooby gets distracted by a dog puppet named Mata Hari, the violin case is stolen. Shaggy, Scooby, and the rest of Mystery, Inc. find a string puppet controller at the scene of the crime and meet the doorman. They follow it to the local theater, where they uncover a counterfeiting operation, supervised by a spooky-looking puppet master. They find the puppet master and reveal him to be Mr. Pietro, who was posing as a friendly doorman. Notes:

• Don Messick also voices the police officer
• Frank Welker also voices Johnny and the girl dog puppet
• Vic Perrin voices Mr. Pietro and the Puppet Master
• John Stephenson voices the pirate puppet and the viking puppet

Mystery, Inc. encounters a midget and a strongman, both on the run from the circus that's allegedly haunted by a ghost clown. They head for the circus grounds to investigate, but Daphne, Shaggy, and Scooby fall victim to the Ghost Clown's powers of hypnotism. Notes:

• Don Messick voices Max and Mr. Barnstorm
• John Stephenson voices Samson the Strongman
• The Ghost Clown is voiced by Barry Richards

While on their way to Franken Castle, Mystery Inc. stops by to have their fortunes told. The strange gypsy warns them that "they will meet their doom" if they head for the castle. Scooby and the gang head there anyway, where they are confronted by Count Dracula, Frankenstein's monster, and Wolfman.

• Don Messick voices the Sheriff
• Frankenstein's Monster, The Vampire, The Wolfman, and Big Bob Oakley are all voiced by John Stephenson
• The legendary June Foray voiced The Gypsy

While visiting the museum to consult the professor and his assistant Dr. Najib, Mystery, Inc. learns about the legend of Ankha, a 3,000-year-old Egyptian mummy. Legend had it that the mummy would come back alive and turn anyone into stone if removed from the tomb. Shaggy later finds a coin inside his pocket from the exhibit. When the teens return to put it back, they find out that the mummy has come to life and turned the professor into stone. And now, he wants Shaggy's coin!

• Don Messick voiced The Professor
• Casey Kasem voiced the Malt Shop Chef
• Dr. Najib was voiced by Vic Perrin
• The Mummy of Ankha was voiced by John Stephenson

While getting lost in the swamp, Mystery, Inc. comes across the zombie that spooks them. In the nearby town of Swamp's End, they learn that a witch brought the zombie to life, and they decide to investigate.

• Don Messick also voiced Zeke and The Witch
• Guest Voice: John Stephenson as The Zombie and the Sheriff

A newspaper reporter informs the local shipping company owner Mr. Magnus that his company is going out of business. The reason is that the ghost of Redbeard is haunting the harbor and looting Mr. Magnus' ships. After reading the story and consulting Mr. Magnus, Mystery, Inc. heads out to the harbor to see if they can stop the specters. But soon, they find themselves trapped aboard the eerie ghost ship.

• The captain in the opening scene was voiced by Casey Kasem
• Frank Welker voiced the talking pirate skull
• John Stephenson provided the voices of C.L. Magnus, The Ghost of Red Beard, The Coast Guard officer, and The Butler

The Mystery Machine runs out of gas in front of a rural farmhouse. There, the farmer warns them of an abandoned airfield nearby, which is haunted by a flying saucer and its ghostly extra-terrestrial pilot called the Space Kook.

• The Space Kook and Henry Bascomb were voiced by Don Messick
• Casey Kasem also voiced the Sheriff
• Hal Smith guest voiced as the Farmer

Scooby-Doo is named in the will of Colonel Beauregard Sanders, an eccentric millionaire whose life he saved several years before. The only way to claim the inheritance is for Scooby, as well as four other heirs, to spend the night in the Colonel's mansion — which they quickly learn is haunted by two phantom shadows. They are later revealed to be two cackling green ghosts, who chase the gang all around the mansion. The gang then unmasks them as Cosgood Creeps and his partner, Cuthbert.

• Don Messick also voiced Nephew Norble
• In addition to his role of Shaggy, Casey Kasem also provided the voices of The Colonel, Cousin Slicker, and the Sheriff
• The voices of Cosgood Creeps and The giggling green ghosts were provided by Hal Smith

Note: In the crossover episode from The CW dark fantasy series Supernatural, Sam & Dean Winchester along with Castiel get transported to this episode by a ghost.^[1]

While on a skiing vacation at Wolf's End Lodge, the teens learn about the legend of the Snow Ghost, a ghostly Yeti who is believed to turn anyone he captures into a white ghost. In search of some clues, Mystery, Inc. encounters a Tibetan Buddhist hermit, who they think is responsible for summoning the monster.

• Hal Smith as Mr. Greenway
• Vic Perrin as The Snow Ghost, Fu Lan Chi, and Mr. Leech

On their way home from the Malt Shop, Mystery, Inc. encounters the ghost of Mr. Hyde in the rear of the Mystery Machine, who races through the marsh and sneaks into a haunted house. This place turns out to be the residence of Dr. Jekyll (the great-grandson of the novel's titular character), who fears he might be transformed into Mr. Hyde. The gang searches the place for some clues, pegging a housekeeper named Helga as the likely suspect. However, they are pursued at every turn by Mr. Hyde.

• In addition to his role of Scooby Doo, Don Messick also provided the voices of the security guard in the opening scene, the malt shop waiter, and the mouse.
• The Ghost of Hyde, Dr. Jekyll, and The Sheriff were all voiced by John Stephenson
• Guest voice Susan Steward as Helga

After attending a Chinese New Year parade in San Francisco, Daphne buys a golden mask at a local curio shop. Mystery, Inc. then pays a visit to Mr. Fong, who tells them the mask was stolen centuries ago from the crypt of an ancient Chinese warlord named Zen Tuo. When Zen Tuo's two zombie henchmen kidnap Daphne and put the mask on Zen Tuo, the teens set out to the temple to rescue her and solve the mystery.

• The Scare Pair were voiced by Don Messick and Frank Welker. Messick also voiced the curio shop owner
• Zen Tuo and Mr. Fong were voiced by Keye Luke

While out on a fishing expedition, Shaggy and Scooby-Doo hook up a 2-million-year-old caveman that's frozen in a solid block of ice, which Mystery, Inc. learns was lost at sea during a violent storm. They then take the Caveman to the Oceanland aquarium. But when someone resembling the professor melts the ice block, causing the Caveman's relentless rampage, the teens decide to stick around and investigate. They trap the Caveman in a giant clam shell and reveal him to be none other than the professor, who wanted to bring the costume to life.

• Don Messick voiced Professor Ingstrom and the Sheriff
• Casey Kasem also voiced the fish
• Frank Welker also voiced the seals and the dolphin
• The caveman and Professor Wayne were voiced by John Stephenson

While on their way to the high school's barn dance, Mystery, Inc. comes across a knocked-out bank guard and his ransacked armored car. The guard mumbles to them some clues and then he's taken at Mr. Carswell's house. They discover that the local banks have been robbed by a mysterious zombie-like phantom called the Creeper, who later shows up at the barn dance, cuts the power, and chases the gang all around the building. The gang manages to capture the monster and finally unmask him, revealing him to be none other than Mr. Carswell.

• The sheriff and Mr. Carswell were voiced by Casey Kasem, while the Creeper was voiced by John Stephenson
• Don Messick also voiced the Hermit, the chick, and the chickens.
• The bank guard was voiced by Frank Welker

The Mystery Machine gets overheated in front of an old spooky mansion. The gang goes to look for help, but they discover that the place is being haunted by the Headless Specter. The mystery gets even stranger when they begin to hear some knocking sounds, as well as some clues leading to the hidden treasure. They find the guy dressed up as a phantom at the end of the episode and unmask him as their friend, Mr. Asa Shanks.

• Penrod Stillwall was voiced by Casey Kasem
• Hal Smith returned to voice Asa Shanks, the headless spectre, and the balloon ghost

Shaggy & Scooby's vacation in Hawaii is interrupted by a ghostly Witch Doctor, who warns the tourists and natives they are on the sacred grounds of an island god named Mano Tiki Tia. They are also told to stay away from the cursed village. Later, the gang's tour guide Mr. Simms goes missing. So it's up to Mystery, Inc. to search for him in the supposedly cursed village, where they eventually run into a second Witch Doctor and a giant living statue. The gang unmasks Witch Doctor and reveals him to be none other than Mr. Simms.

• Mr Simms, the Witch Doctor, and Mano Tiki Tia were all voiced by John Stephenson
• Lt. Tomoro and the old man were voiced by Casey Kasem

While relaxing during a camping trip, Mystery, Inc. hears the sound of a wolf howling through the night and finds strange wolf-like tracks on the ground. They follow them throughout the forest to the open, empty grave of a man named Silas Long, who was supposedly transformed into a werewolf. They follow his tracks even further to an abandoned sawmill filled with wool, empty barrels, and short tubes sticking out of them, as well as the werewolf himself.

• Frank Welker voiced the werewolf while Don Messick voiced the Sheriff

While participating in the Johnny Sands Dance Game Show at a local television station, Mystery, Inc. encounters a phantom made of wax, who steals a safe filled with money and kidnaps the station manager. They track him down to a nearby wax museum full of famous figures used in motion pictures and television programs, where the phantom relentlessly pursues them.

• Don Messick also voiced Roger Stevens, Grisby, and the sheriff
• Johnny Sands was voiced by Casey Kasem
• The Wax Phantom was voiced by Michael Stull

Note: This was the original series finale for Scooby-Doo, Where Are You! until September 1978.

When Velma's Uncle Dave goes missing, Mystery, Inc. attempts to find him. On their search, they're attacked by the legendary Willawaw, which is said to have captured some people if an owl calls their name.

• Dave Walton was voiced by Casey Kasem
• Red Herron was voiced by John Stephenson
• Grey Fox was voiced by Lennie Weinrib

While on a boat flowing down the Gulf Stream, Mystery, Inc. witnesses a flying saucer hijacking some airplanes. They crash into Diablo Island, where they encounter a creepy sea captain and his trio of one-eyed skeleton henchmen.

• Dr. Grimsley and the Skeleton Men were voiced by John Stephenson

After being invited by Professor Krueger at the North Pole, the gang finds out that he has been captured by a terrifying dinosaur-like monster. After they meet an Inuit named Chief Minook, he gets captured as well, and the gang must step in to solve the mystery.

• Frank Welker, in addition to his regular role of Fred, voiced the Snow Beast
• Professor Krueger, Chief Manook, and the pilot were all voiced by John Stephenson
• Jean Pierre Baptiste was voiced by Alan Oppenheimer

On Halloween night, the New England town of Salem, Massachusetts is being haunted by the ghost of a cackling witch named Melissa Wilcox, who was burned at the stake in 1778. After receiving a distressed call from their friend Arlene Wilcox, a descendant of the accused witch, the gang arrives to help, despite being warned off by the town's paranoid mayor. The gang realizes the witch looks exactly like Arlene.

• Arlene Wilcox, her twin sister, and the Ghost Witch of Old Salem were voiced by Janet Waldo

The gang heads for Turkey, where the ancient city of Byzantius is being excavated. But the professor informs them that while uncovering the inner sanctum, his workers are frightened away by the city’s ancient guardian, supposedly a monster from the tar pools.

• Stoner was voiced by Frank Welker, while the Tar Monster was voiced by Michael Bell
• Don Messick also voiced the Spider
• John Stephenson voiced Professor Brixton
• Kareem was voiced by Henry Corden

The gang heads for Scotland to visit their friend Aggie MacDuff, whose family castle is being plagued by the ghost of her great-grandfather Finian McDuff. It seems the ghost plays his bagpipes to call on the Loch Ness Monster to help him frighten some guests away from the castle.

• Jamie Craigmore and The Ghost of Finnyan McDuff were provided by Henry Corden

As the gang goes water-skiing, they have a near-fatal encounter with a masked figure and his sharks. While dining at a seaside restaurant, they found out that the figure was none other than Old Iron Face, a convict with an iron mask welded onto his face. The team then ventured out to Skull Island, where the ghost was lurking. And there, they find Captain Morgan, who supposedly disappears while exploring the prison.

• Old Iron Face was voiced by Allan Melvin, while Mama Mione was voiced by Virginia Gregg.
• Melvin also voiced Agent Hargrove, while Captain Flint was voiced by Frank Welker
• In addition to his role of Shaggy, Casey Kasem also voiced Captain Morgan.

After an emergency landing in a jungle somewhere at the Amazon Basin in Brazil, the gang encounters the Jaguaro, a terrifying creature with the head of a black Smilodon and the body of a gorilla, who's hailed as a deity by the natives, haunting the jungle.

• Jaguaro was voiced by John Stephenson, while Barney was voiced by Frank Welker. Stephenson also voiced Luis.
• Jose was voiced by Casey Kasem

While the gang visits New York City to meet Daphne's Aunt Olivia, Shaggy and Scooby witness a cat creature robbing the jewelry store on their way to the apartment. When they arrive, Olivia told them that she received a strangely unexpected package, containing a cat medallion. Shaggy and Scooby traces the return address, but they find out that it's sent from the cemetery.

• Casey Kasem also voiced Mr. Bixby and Dr. Bell.
• Frank Welker also voiced the cab driver.
• Radio and television veteran, Shirley Mitchell guest voiced as Olivia Dervy.

While visiting Professor Greer at a botanical garden resort, the gang encounters a seven-foot praying mantis who's trying to scare him off.

• Professor Greer was voiced by Frank Welker, who also voiced Eric Arby and the mailman
• Clive Dickerman and Harry Keeble were voiced by Michael Bell.

Note: this is the last episode in season 3 broadcast under the Scooby-Doo, Where Are You! banner, as the revival series was cancelled.

The gang heads for Decade Records recording studio to see a live recording from their friend Jimmy Lewis. However, when songwriter Tony Synes disappears and a ghostly musician begins searching for his latest song, it's up to the gang to solve the mystery.

• Ace Decade and the Phantom were voiced by Michael Bell.
• Jimmy Lewis was voiced by Wayne Morton.
• Joe was voiced by Alan Oppenheimer

While stranded at a Chinese palace, the gang stays with Kim, who's about to receive a large inheritance. When the team stops for some rest, they're awakened by the Moon Monster, who is wanting to steal the family's jewels.

• Chin Wong Sing and the Moon Monster were voiced by Alan Oppenheimer
• Frank Welker also voiced Kim Chow Ling and Ling Foo

While visiting their friend Antonio in Venice, Italy, the gang encounters a ghostly gondolier, who captures Daphne, as well as Antonio, while trying to find an ancient necklace.

• Don Messick also voiced Mario and the Ghost Gondolier
• Casey Kasem also voiced the Gondolier
• Professor Salari was voiced by John Stephenson
• Antonio and Doge Malvolio IV were voiced by Allan Melvin

The gang arrives at Puerto Rico to visit the ancient fortress El Morro. While there, they encounter a supernatural general who warns them away from his creepy fortress.

• Captain Eddy and the Ghost of Juan Carlos were voiced by John Stephenson
• Frank Welker also voiced the Hall of Records Curator, Diego, and Petro
• Casey Kasem also voiced Inspector Armandez

In England, the gang meets up with tennis star Jimmy Pelton, who has been cursed by the sinister Warlock Anthos. If he tries to play in Wimbledon, he is doomed.

• Nick and John Thomas were voiced by Frank Welker and Vic Perrin. Perrin also voiced Anthos.
• Jimmy was voiced by Michael Bell

While on a pike-fishing trip in Canada, the gang encounters a lake monster, who scares off the townsfolk from a newly deserted village. When they attempt to go underwater, Shaggy and Scooby are nearly captured by the beast.

• In addition to her role of Velma, Pat Stevens also voiced Julie.
• Hal Smith voiced Chevaux Le Beau and Mr. Taylor