Casper's Scare School - Merry Scary Christmas (2009)

Actors:

For ghosts, werewolves, vampires, zombies and o ther creatures of the night anything goes except making friends with humans! When Casper, the world's friendliest ghost, befriends a human kid, his uncles decide to send him off to the one place in the world (or the underworld) that can cure him of his friendliness once and for all: Scare School.