Jack Skellington is a character from all Kingdom Hearts games.
Known as the Pumpkin King sometimes, Jack is the biggest celebrity in Halloween Town. He is the star of The Nightmare Before Christmas.
The Movie
In The Nightmare Before Christmas Jack tired of the same routine every Halloween. While walking in the woods Jack finds a way into Christmas Town. Jack then decides to kidnap Santa Claus, and take his role in the celebrating. It ends in disaster and Santa is prisoned by Oogie Boogie. But in the end Jack defeats Oogie and saves Christmas.