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.

When a meteorite from outer space hits a young California woman named Susan Murphy and turns her into a giant monster, she is taken to a secret government compound where she meets a ragtag group of monsters also rounded up over the years. As a last resort, under the guidance of General W.R. Monger, on a desperate order from The President, the motley crew of Monsters is called into action to combat the aliens and save the world from imminent destruction!

On Christmas Eve, Private slips out of the zoo for some last-minute shopping. In the city he's mistaken as a cute chew toy by a mean old woman named Nana, who gives Private to her vicious dog, Mr. Chew. On a mission to rescue their penguin pal, Skipper, Kowalski and Rico risk life and flipper as they take on Nana and Mr. Chew with an explosive solution that will leave you laughing out loud.