Story: A lost pilot fish who eats ocean gunk cleans up the Octonauts dirty gups but he's still hungry. Meanwhile, Captain Barnacles must figure out why a whitetip shark is chasing the Gup-A.

The Octonauts is a British children's television series, produced by Silvergate Media for the BBC channel Cbeebies. The series is animated in Ireland by Brown Bag Films but uses British voice actors. The TV series is based on American-Canadian children's books written by Vicki Wong and Michael C. Murphy of Meomi Design Inc.