- Kôsuke Toyohara
- Kenichiro Terasawa
- Anna Nakagawa
- Emmy Kano
- Megumi Odaka
- Miki Saegusa
- Katsuhiko Sasaki
- Professor Mazaki
- Akiji Kobayashi
- Yuzo Tsuchihashi
- Tokuma Nishioka
- Takehito Fujio
- Yoshio Tsuchiya
- Businessman Yasuaki Shindo
- Chuck Wilson
- Chuck Wilson
- Richard Berger
- Grenchiko
- Robert Scott Field
- Android M-11
- Kenji Sahara
- Minister Takayuki Segawa
- Kiwako Harada
- Chiaki Moriyuma
- Kôichi Ueda
- Ikehata, the mad old soldier
- Sô Yamamura
- Prime Minister
- Yasunori Yuge
- Army Chief
- Kent Gilbert
- U.S. Ship Commander
- Daniel Kahl
- Major Spielberg
- Kenpachirô Satsuma
- Godzilla
- 'Hurricane Ryu' Hariken
- King Ghidora
- Wataru Fukuda
- Godzilla-Saurus
- Jeff Berglund
- U.S. Navy Aide
- Mark Foucannon
- M102 Android
- Michael Foucannon
- M101 Android
- Chuko Fujimoto
- Newscaster
- Susumu Kurobe
- Fuyuki Takaoka the Flight Chief
- Kenzo Ogiwara
- Takeo Shimura
- Ginnosuke Azuma
- Morris / Morrys (uncredited)
- Chris Hilton
- Takehito Fujio
- Kôichi Kawakita
- Underground shopping center patron
- Andrew Smith
- American serviceman
- Tetsu Watanabe
- Lagos Island Japanese Army Sergeant
