Jack Skellington (voiced by Chris Sarandon) is the main character of Jaden's Adventures of The Nightmare Before Christmas. He is the patron spirit of Halloween, and the Pumpkin King. But after doing the same thing every year, he has grown tired of Halloween. When he stumbles upon the world of Christmas, he becomes immediately fascinated by it. Jack then believes that he should give it a try being Santa Claus. The residents of Halloween Town make scary toys, and the real Santa is taken to Oogie Boogie (which Jack has no knowledge of). Christmas becomes a nightmare as all the gifts that Jack leaves attack the people. The military shoot him down, but he survives, and regains his interest in Halloween. He saves Santa from Oogie, and becomes a couple with Sally.
- Jack Skellington will meet Jeffrey and his team in Jeffrey & Friends' Adventures of The Nightmare Before Christmas.
- Jack Skellington will guest star in Jeffrey, Jaden & Friends' Storm Adventures of Goosebumps