A robot, Pluto is built to kill the 7 strongest robots in the world, therefore making him the world's most powerful robot.
Mari Shimizu
Atom
Kazue Tagami
Atom (voice)
Youko Mizugaki
Uran
Akihiko Mitsueda
Atlas
Seizo Kato
Skank (voice)
Shingo Kanemoto
Detective Tawashi
Kiyoshi Komiyama
Cobalt
Masaaki Yajima
Higeoyaji (Shunsaku Ban)
Hisashi Yokomori
Tenma Hakase
Shinpei Sakamoto
Detective Nakamura
Iemasa Kayumi
Skunk
Kei Taguchi
Lamp
Hisashi Katsuta
Ochanomizu Hakase
Kazuo Kumakura