When Scooby complains of a stomach ache, the gang takes him to an animal hospital, not knowing that a werewolf haunts the building.
Shaggy and Scooby make the decision to leave the gang and train their replacements during an investigation.
Eight different monsters appear when the gang is on a three-day train trip.
On Halloween, Fred refuses to leave the house because he believes that no mysteries will be solved and nothing will go as planned.
When the gang visits Japan, Daphne outranks Velma's popularity; when the crab monster Kaniaku attacks, the girls must put aside their jealousy and solve the 700-year-old monster mystery to save the day.
The Scooby gang tries to get to the bottom of a ghost tormenting Scrooge in 1843 England.
A bad parking choice on Fred's part leads the gang to an asteroid mining base in outer space, where an alien virus appears to be infecting the crew; the crew gets infected one by one, turning into evil, skull-headed aliens.
To escape a snowstorm, the gang checks into a big, creepy hotel run by a man very strict about the hotel rules established by his deceased mother.
The gang tours an old Hollywood Studio; 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.
Fred's worst nightmare comes true when an evil spirit possesses the Mystery Machine and turns his beloved van into an unrelenting monster.
Daphne brings the gang to a fancy ice hotel where a new exhibit of ice age artifacts is opening; things heat up when a frozen ice man goes on a rampage inside the hotel.
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.
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.
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.
The gang goes to Salem, Mass., for a historical festival, only to discover a demon has been set loose on the town.
Shaggy drags the gang to his familiar childhood arcade, where he's determined to collect enough tickets to win the one prize he's wanted since he was a boy.
The gang is forced to compete against a rival team led by one of Fred's old friends.
Fred gets a call for help from Chuck, his daredevil of a best friend, leading the gang on a rescue mission deep in the caverns of an ancient civilization.
The gang visits the set of Scooby's favorite TV show and he meets a dog actress who plays a detective on the screen.
Daphne brings the gang to a Victorian murder mystery party so they can dress up and solve a fake mystery; when a headless count starts kidnapping people, the gang must stay in character as they tackle the real caper.