The gang are visiting the Tibetan Mountains and come across a Cat Man and his gang of evil felines. The Cat Man throws Shaggy, Scooby and Scrappy into the shrinking water fountain reducing them to the size of mice. In their tiny form, the three manage to eventually push the Cat Man into the shrinking water fountain and then escape. Once away from the Cat Man's hideaway the three return to their normal size.
The kids are mysteriously sent train tickets to board the Orient Express, for a trip. But when they get their Scooby's bag is switched with another one, and when he goes in search of his bag full of Scooby Snax, he turns up missing as well. Did the mummy kidnap Scooby, or the spy who stole the fuel formula?
The gang is invited to a television studio in Los Angeles for Scooby's birthday, which is to be celebrated with a This is Your Life-style special hosted by Mark Winkendale and directed by Milo Spender. To Scooby’s happiness, he also reunites with Velma and Fred on the show, both of whom have gotten their own careers. However, a vengeful villain from Scooby’s past tries to ruin the night for him and the gang.
The gang is invited to a television studio in Los Angeles for Scooby's birthday, which is to be celebrated with a This is Your Life-style special hosted by Mark Winkendale and directed by Milo Spender. To Scooby’s happiness, he also reunites with Velma and Fred on the show, both of whom have gotten their own careers. However, a vengeful villain from Scooby’s past tries to ruin the night for him and the gang.
The gang is hired by newspaper publisher Orson Kane to interview the reclusive Norma Deathman, who lives with her monstrous servants. Since she is having a birthday party, the gang disguises themselves as caterers in order to gain entry to her house, but when Deathman realizes who the gang actually is, they have to run for their lives from her and her monsters.
In Greece, Scooby, Scrappy, Shaggy, and Daphne and a secret agent (taking the role of a café owner) head to find a missing professor and stop Thaddeus Blimp and his henchman Wilmer from turning al his enemies and the world leaders to stone using the Mask of Medusa. Though both sides have to contend with a Cyclops.
On Halloween night after being lured to a party at a castle, the gang who are accompanied by Fred and Velma discover that the party is held by the actually Count Dracula, his wife, and their assistant Igor with guests like Frankenstein's monster, the Wolfman, the Mummy, the Gill-man, and the Invisible Man. The gang must help the monsters take on the evil magician Chandra and a ghost of known monster hunter Dr. Van Helsing before it’s too late.
Fred joins the gang in a mystery-solvers' contest at the home of Sherlock Holmes in London where they encounter the other contest participants Iggy and Ziggy Moriarty. While solving one of Sherlock Holmes’s old cases, the Ghost of Sherlock Holmes appears. But is his goal to assist the gang in solving the mystery or frame them for a theft?
Fred joins the gang in a mystery-solvers' contest at the home of Sherlock Holmes in London where they encounter the other contest participants Iggy and Ziggy Moriarty. While solving one of Sherlock Holmes’s old cases, the Ghost of Sherlock Holmes appears. But is his goal to assist the gang in solving the mystery or frame them for a theft?