Iron King
However, often Iron King is unable to defeat the clan's giant robots without help from Gentaro, who wields a weapon called the "Iron Belt" that can become a slender rapier-like sword or an infinitely extendable metal whip capable of hurting giant monsters. In addition, transforming into the hydrogen oxide-powered Iron King quickly dehydrates Goro, and he can only remain as Iron King for a short period of time. Strangely, although Gentaro knows Iron King's time limit comes from using up his water supply he never manages to connect it with Goro's omnipresent thirst until the final episode.