At a seafood restaurant, the ghost of a legendary pirate, Half-Beard, has been scaring away the customers. Captain Cutler joins the gang on a treasure hunt at Double-Cross Cove where Half-Beard's treasure is supposedly buried.

A virus infects an asteroid mining crew one by one, turning them into evil skull-headed aliens.

To escape a snowstorm, the gang checks into a creepy hotel run by a man with strict rules.

Shaggy drags the gang to an arcade where the animatronic mascot has apparently come to life.

The gang investigate the mysterious Professor Huh?, who pits them against another rival gang led by an old childhood friend of Fred.

Fred is put on trial after he is wrongfully accused of dressing up as a toxic waste mutant. The trial goes further awry after Fred is accused of inventing every mystery he has ever solved. Though Daphne agrees on being Fred's defense lawyer, her and the rest of the gang's antics serve no help to Fred, who risks being put away in prison if charged with the crime.

The gang visits a bayou in New Orleans, where a swamp monster is frightening away anyone who comes into his swamp. Meanwhile, Daphne pretends to be a vampire.

While trick-or-treating with his cousin Scott and a friend when he was little, Fred has a scarring experience when he is ambushed by an evil witch near an abandoned cabin. Several years later, Fred and the gang run into the very same witch on Halloween night in another town. As the gang attempts to solve the mystery of the witch, they must also convince Fred that he is incorrect in his belief that a mystery cannot be solved on Halloween night.

The gang is invited to a monster mystery party, where they try solve the mystery of a fake ghostly apparition. When a real monster shows up though, Daphne Blake and Fred Jones are left to solve the mystery on their own, because no one else will believe them.

Velma's got an interview at the prestigious Kingston University, the most selective school in the country. The only catch? The dean wants her and the rest of the Scooby gang to figure out why the ghost of Elias Kingston, the school's founder, is haunting Kingston's book-filled halls!

The gang goes aboard the Air Gigantica and tries to stop a gremlin from sabotaging the flight. Meanwhile, after the pilot quits, Daphne has to try to land the plane safely before it crashes.

The gang goes to the Sorcerer Snacks factory, where a real sorcerer is scaring everyone away. Meanwhile, Fred finds he can get Shaggy and Scooby to do anything he wants with a box of Sorcerer Snacks (a precursor to Scooby Snacks).

Velma runs for mayor to bait the ghost that has returned to a town and scare the mayoral candidates.

Fred takes the gang to Mexico so they can experience the local Day of the Dead festivities. A mystery quickly pops up involving a long-dead historical figure named El Bandito, causing Fred to want to make himself a legend just like El Bandito. During the mystery, Daphne believes her deceased Aunt Cookie is communicating with her somehow.

Shaggy and Scooby, sick of the monsters and mysteries, leave the Mystery Gang.

The gang heads to Shaggy's beloved grandmother's Florida retirement home, where they learn a crazed ape man has been frightening the elderly residents.

It's a classic haunted house caper when a rich man, whose life Scooby once saved, writes Scooby into his will! Now, to collect his share of the fortune the gang must spend a night in a creepy mansion along with the rich man's kooky relatives and a spooky phantom!

The gang visits the town of Rockwellville in search of a Christmas mystery, but all they find is a pterodactyl who seems to have nothing to do with Christmas. Meanwhile, Daphne, who is tired of having her December 25th birthday overshadowed year after year, tries to convince the gang to celebrate her birthday instead of Christmas.

Fred takes the gang to visit The Vault, an old prison that is haunted by the ghost of Stealin' Stan, who died trying to escape from the prison.

The gang goes to a farm, where Fred develops a crush on Beth, a farmer's daughter. When a living scarecrow appears, Fred tries to impress Beth with his mystery solving skills, while Velma gets severe hay allergies and Daphne begins hoarding animals as "pets" after becoming jealous of Shaggy and Scooby's relationship.

After Daphne agrees to babysit her friend's son, Wayne, the gang ends up going to an amusement park where an insane killer clown is lurking. Daphne attempts to focus on allowing Wayne to have a good time, but the rest of the gang investigates the park and tries to solve the mystery of Madcap, the killer clown.

The gang travels to Britain in 1843-ish and runs into Scrooge who claims he was attacked by the ghost of his partner Jacob Marley and that three more ghosts are coming. The gang agrees to solve the mystery but Velma wonders if she has more potential than just solving mysteries.

The gang decides to go to a dog show in New York, but they soon discover a mystery. With Fred undercover, Scooby trying to win the respect of other dogs, and Velma and Shaggy switching personalities, it's going to be a tough case to crack.

The gang tours an old Hollywood Studio, but they soon uncover a mystery concerning the ghost of a silent film comedy star who has returned to make sure his recently discovered final film is never seen.

Fred gets to live out his childhood dream of being a stage magician when a mutant rabbit monster terrorizes a magic club.