The Skeleton Crew, also referred to in show credits as Boneheads, are Kinga Forrester's minions on Moon 13 who were origanily intended by her to be "a race of atomic supermen who would conquer the world", but ended up functioning as a ska type musical group. Their motorcycle helmets have two bones protruding out in a formation reminiscent of TV "rabbit ears" antennae.
The Skeleton Crew serve as the show's band, led by Har Mar Superstar. During breaks, they play instrumental versions of classic MST3K songs (such as "Livin' in Deep 13" and "The Canada Song") as bumpers while Max offers humorous observations on the movie and shares trivia about Kinga's operations and inventions.
In addition to providing a toe-tapping soundtrack, the Skeleton Crew serves as Kinga's henchmen. They push Jonah into the tube during the opening and also are seen wrangling Moon 14's genetically-engineered dinosaurs for Kinga's short-lived Mesozoic Ranch Dinosaur BBQ restaurant. Two members of the Crew are responsible for putting the Liquid TV vial of the finished episode into a board behind Kinga and Max at the end of each episode.
Their outfits bear a strong resemblance to the skeletal foot soldiers from the Chinese superhero film Super Inframan.