- Shin'ichi Chiba
- Shinichi Tachibana / Iron-Sharp (as Sonny Chiba)
- Ryûko Minakami
- Tanigawa Yoko
- Mitsue Komiya
- Saito - Scientist
- Seiichirô Kameishi
- Yamagata Yukichi
- Rin'ichi Yamamoto
- Colonel Fujimoto
- Kappei Matsumoto
- Dr. Tanigawa
- Takashi Kanda
- Defence Chief Takita
- Shirô Okamoto
- Eiji Shindo
- Junji Masuda
- Dr. Tamiya
- Hidemichi Ishikawa
- Dr. Yoshimoto
- Shinjirô Ebara
- Yanagida - Scientist
- Harold Conway
- Washington Broadcast Station Chief
- Genji Kawai
- The Guard
- Yoshihiko Matsuoka
- Alien B
- Masazumi Okabe
- Railway worker
- Kôsaku Okano
- Reporter A
- Kôji Sahara
- Garrison Chief Mikami
- Akikane Sawa
- Land Commander Inukai
- Kôji Sawada
- Cosmos Man
- Kôji Sekiyama
- Karimasu
- Ken Sudô
- Staff Chief Miyake
- Teruyoshi Takenaka
- Alien C
- Kenji Todoroki
- Alien A
- Robby the Robot
- Toy
