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 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).

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.

The gang's trip to a ski resort is interrupted by a snow monster terrorizing the tourists. Meanwhile, Daphne attempts to get revenge on Fred for hitting her with a snowball three years ago by planning a snowball attack.

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 the ghost of the Cliff Bride begins haunting a wedding that the gang is attending, they must go to extreme lengths to try to keep the bride, who is very superstitious, from finding out. However, this proves very challenging when the ghost seems to appear everywhere that the bride is. Meanwhile, Daphne becomes very wrapped up in the ideology of wedding traditions and Shaggy worries obsessively about his best man speech.

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.

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.

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.

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 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 heads to a renaissance fair from Velma's childhood and must act out the middle ages. A mystery is revealed when the spirit of a jester begins attacking the fair and the gang must quickly come to the rescue.

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 is on a 3-day trip on a train, but when 8 monsters from different parts of the world appear, it's time for action. The monsters are the Grim Reaper, a Mummy, Tzitzimitl, Haniver, a Manticore, Hemogoblin, Tengu, and Tarasque.

Fred tries to solve a 700-year-old mystery in Japan; Daphne becomes a viral sensation.

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

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.

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.

The gang gets trapped in an ancient Greek palace, where they must find a scroll to escape.

Shaggy is surprised to see his old childhood first crush has become a goth; embarrassed that he hasn't changed at all, Shaggy attends a goth party with the gang.

The gang gets caught up in international espionage when they cross paths with British secret agent, Jenny Vex, and must help her complete her dangerous mission.