Gastro is a terror bird who appears in The Terror-Bird Trap as the benevolent leader of Queen Soapi's avian assistants. He and his friends Gordon, Godfrey, Gideon, Gary, and Gus were chased off of Terra Nesta because they refused to act like terror birds, becoming plumbers and vegetarians. They fled, but their ship crashed on Atlantos and they were adopted by the native bactrosaurs, who they gave plumbing to in exchange for a place to stay.