Jack Skellington, Pumpkin King, ruler of Halloweentown, happens upon Christmastown, and decides to change Christmas into another Halloween. He kidnaps Santa Claus, then takes it upon himself to deliver some alternative gifts to unsuspecting children.
An elf juggles a 3 snowball cascade that is rendered perfectly, 14
minutes into the movie. There's a clown on a unicycle in several
scenes throughout the film.