In “The Nightmare Before Christmas,” Jack Skellington’s ghost dog is named Zero.
Zero is Jack’s loyal companion in Halloween Town and appears as a translucent, floating dog with a glowing jack-o’-lantern nose. That tiny pumpkin acts like a supernatural lantern, especially when Zero helps Jack navigate the foggy sky during Jack’s Christmas Eve flight. Although he has no spoken dialogue, Zero is an expressive and memorable presence throughout the film.
Zero’s name is a playful fit for a ghostly dog: it suggests emptiness or nothingness, while also sounding like the name of a faithful pet. His design reinforces the movie’s blend of Halloween imagery and cute character animation. He is often seen hovering near Jack’s side, reacting to Jack’s schemes even when the other residents of Halloween Town are uncertain about them.
Viewers sometimes confuse Zero with Lock, one of the three trick-or-treating children who serve Oogie Boogie. Sally is Jack’s love interest, while Oogie Boogie is the film’s principal villain. The film was released in 1993 and was directed by Henry Selick, with Tim Burton as writer and producer.