It’s Halloween and friends Nick and Kate are on a mission to find the biggest pumpkin in the patch. Unfortunately, the pumpkin they choose is haunted by the ghost of the Headless Horseman, and he wants his head back.
Shrek gets in the Halloween spirit by challenging his fairytale friends to come up with scary stories for a contest. But the gang learn that they’ll have to spend the night in Lord Farquaad’s haunted castle before the winner is named.
The gang goes on a trip to check on Velma’s younger sister, Madelyn. She’s been studying stage magic at the Whirlen Merlin Magic Academy, where apparently there have been sightings of a giant griffin. The gang decides to investigate.
The gang’s vacation to Paris takes a wrong turn when Scooby and Shaggy miss their flight and end up on a skydiving expedition in the Himalayas. To make matters worse, upon arrival they must outrun the Abominable Snowmonster.