Jum Killer (ジャンキラー Jankirā?) is one of Mad Go-Ne's creations used to imitate Jumborg Ace, it first appeared in episode 27. A second was created known as Jum Killer Jr. (ジャンキラージュニア Jankirā Junia?) in episode 43. Subtitle: Formidible Robot Enemy (強敵ロボット Kyōteki Robotto?)