Jack Skellington is the lead character in the 1993 animated film "The Nightmare Before Christmas." He is the King of Halloween Town, a town where the citizens celebrate the spooky season all year long. Jack is a bit of a troublemaker, always looking for new ways to spice up the holiday. In the movie, he accidentally discovers Christmas and becomes obsessed with it, leading to a series of hilarious and heartwarming adventures. Jack is a beloved character with a unique style and a playful personality.