The Nightmare Before Christmas doesn’t explain or give hints about Jack Skellington’s backstory, but his appearance in another movie might have revealed he was a pirate. Directed by Henry Selick with a story by Tim Burton, The Nightmare Before Christmas was released in 1993 and introduced the audience to Jack Skellington, a skeleton who lives in Halloweentown and serves as its Pumpkin King, leading the yearly Halloween celebrations. Tired of doing the same things every year, Jack wanders through the forest and comes across the doors to other Holidays, and becoming fascinated by Christmas Town, he decides to bring Christmas to Halloweentown.

Thanks to his unique design and story, Jack Skellington has become part of pop culture and one of the most beloved animated characters – it’s no surprise, then, that Jack has appeared in other movies by Selick, from Tim Burton’s universe, and outside these worlds. One cameo appearance,...