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.

Shrek is bored on Halloween, and wants to have something scary. The power of Thriller gives him more than he bargained for.

Of the famous Three Little Pigs, Heimlich is the one porker who finds a conspiracy around every corner. When The Big Bad Wolf moves in next door, Heimlich tries to warn his piggy pals Horst and Dieter that this may not bring a fairy-tale ending. Tired of hearing him 'cry wolf,' they ignore Heimlich's warnings until it's almost too late for them to live happily ever after. The chase is on!

After a mutant alien pumpkin explodes on the Murphy's carrot garden, zombie carrots start attacking the immediate area, and it's up to the Monsters to save the night again.