Gigantron (Dodecane in Japan) is a Big Boy robo that appears in Custom Robo (Nintendo 64), Custom Robo V2, and Custom Robo Arena. It is a Normal Style robo in the N64 titles and an Armor Style robo in Arena. It is used by Marv in all three games as well as Cheepers in Arena. It has an upgraded version in Custom Robo GX known as Gigantron Turbo.