The interplanetary spacecraft Galileo II carries Atom and his friends to Titan, a satellite of Saturn. However, what awaits them when they arrive there is an attack from an unknown entity. What appears is a mechanical life form called "Igza" that wants to destroy humans. The battle between Atom and Igza unfolds in the far reaches of space.
Makoto Tsumura
as Astro Boy/Atom (voice)
Miki Maruyama
as Uran (voice)
Hisashi Katsuta
as Dr. Ochanomizu (voice)
Ami Koshimizu
as Ena (voice)
Chikao Ohtsuka
as Dr. Tadeue (voice)
Unsho Ishizuka
as Igza (voice)
Motoko Kumai
as Tamao (voice)
Susumu Chiba
as Shibugaki (voice)
Yuuko Satou
as Kenichi (voice)
Toshihiko Nakajima
as Captain (voice)