One night a year, Santa J. Claus delivers presents to the children of the world... but for the rest of the time, he's protecting the world as the top secret agent of the Xtremely Mysterious Agency of Secrets (X.M.A.S.), dishing out his own brand of justice to the world's most dastardly criminals. Santa and his Little Helper, newly qualified X.M.A.S. agent Jingle Bells, are on the trail of Dr Cumulus Nimbus, who's hell-bent on creating a new ice age... and Santa hates snow! Can they stop the evil plot before the world is snowed under?

Being a monster isn't as easy as it looks! Gormy's parents are going away for the evening and that can only mean one thing — a monster-sitter! Oh no! But when Nana the Noog arrives, she's like no monster-sitter Gormy's had before. And when the sun goes down, he'll find out just how different she is! He's going to have to use every monster skill he has to survive until morning.