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Cobalt (Jetto), a defective prototype of Astro built by Dr. Tenma, is released from storage and becomes Astro's older brother.
Release date: 1964-11-07
Season number: 1
Episode number: 93
Runtime: 27 minutes
Kazue Tagami - Atom (voice), Youko Mizugaki - Uran, Akihiko Mitsueda - Atlas, Shingo Kanemoto - Detective Tawashi, Kiyoshi Komiyama - Cobalt, Hisashi Yokomori - Tenma Hakase, Shinpei Sakamoto - Detective Nakamura