Ultimate Canth's Demon Sword (最強カンスの魔剣 Saikyō Kansu no Ma Ken) is the thirtieth episode of Choudenshi Bioman. It is the appearance of the last of Gear's initial Mecha Gigan, with the squadron using a new giant system from the next episode. In the Philippine Dub, the title of the episode changed to "Red One's Called Marriage".