Yes, there is a sequel to "The Nightmare Before Christmas" titled "Tim Burton's The Nightmare Before Christmas: The Pumpkin King." It is an animated musical film that picks up where the original left off, exploring the aftermath of Jack Skellington's return to Halloween Town and the impact of his actions on the residents of the town. It features many of the same characters as the original, including Jack, Sally, Zero, Oogie Boogie, and Santa Claus. It was released in 2005 and received mixed reviews from critics.