Gantu, also known as Captain Gantu during Lilo & Stitch, the end of Leroy & Stitch, Stitch & Ai, and in other spin-offs, is Lilo and Stitch's former arch-nemesis, serving as the main antagonist of the original film, the secondary antagonist of Stitch! The Movie and Lilo & Stitch: The Series, and eventually teaming with Lilo and Stitch on the hero side during Leroy & Stitch. An extremely large and muscular alien with a gruff, militant personality, Gantu resembles a bipedal whale or shark with grey skin, sky blue eyes, and elephant-like feet. He wears a black battle shirt with black pants and stands 20 feet tall. When he is seen by humans on Hawaii, he typically attempts to pass himself off as a Samoan, though Lilo once told Mertle he was a dogcatcher from Nairobi, which Mertle believed. Lilo calls him "Big Dummy" for most of the series.