They are a group of live-action pirates. Many of them wear tattered clothes and bandanas. Their captain, Bart, has a gray beard and a large pirate captain's hat. He is always accompanied by his pet parrot, who is voiced by Stephen Hillenburg.
Role in the film
The pirates are fans of SpongeBob SquarePants who get tickets to the movie. They sing the theme song as they steer their pirate ship to a movie theater. When they arrive, they flood the theater and eat buckets of popcorn.
They are very invested as they watch the movie and start to cry when SpongeBob and Patrick dry up in Shell City. However, when SpongeBob and Patrick come back to life, the pirates cheer and celebrate. The pirates later appear in a post-credits scene, in which an usher tells them to leave. The captain asks the usher to repeat herself and points his sword at her, but she stands by her statement, and all of the pirates walk out.