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.

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

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 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).

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.

Fred's worst nightmare comes true when an evil spirit possesses the Mystery Machine and turns his beloved van into an unrelenting monster.

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.

With Fred not sleeping the gang decides it is time for a vacation. However their relaxation is short lived when a monster shark terrorizes the beach. The gang must solve the mystery whilst making sure Fred relaxes and doesn't get involved

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.

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

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.

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

To solve the mystery of a creepy Crystal Crawler - a bat-like cave monster - the Gang must venture into the Crystal Canopy - a labyrinth of intricate crystal formations. To make things worse, they can't speak a word while in the Canopy, because even the slightest sound will bring the crystals crashing down around them!

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

When Scooby falls sick, the gang immediately rushes him to the hospital, only to discover it is being haunted by a werewolf. The gang must help Scooby and solve the mystery.

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

The gang visits the set of Scooby's favorite TV show and he meets a dog actress who plays a detective on the show.

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.

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.

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.

The gang climbs aboard the cruise ship run by Fred's cousin despite Velma's strong dislike of water.

The gang visits a technology company to solve the mystery of an evil robot who has been wreaking havoc.

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!

Scooby Doo runs into an old kennel mate from the rescue shelter, Axel, who is now a state-of-the-art, highly trained K-9 police dog.

Fred and the Gang go to the history of mysteries museum. When the God Sobek trashes the Egypt Exhibit the tour guide offer challenges Fred's leadership and leads the Gang.

Shaggy takes the gang to the Minor League Baseball stadium of his youth only to learn it's about to be shut down because a ghostly baseball player is scaring away all the fans.

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

Shaggy and Scooby's favorite chef is finally opening his own restaurant but a monstrous Yeti threatens the opening night. The gang has to solve the mystery before dessert is served, while Shaggy and Scooby have to resist eating all the food that's meant for the customers!

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.

When a successful video game company tries to convince Velma to work for them in San Francisco, the gang becomes embroiled in the mystery of a video game villain.