Kenichiro Terasawa (as Kosuke Toyohara)
Emmy Kano
Miki Saegusa
Professor Mazaki
Yuzo Tsuchihashi
Takehito Fujio
Businessman Yasuaki Shindo
Chuck Wilson
Grenchiko
Android M-11
Minister Takayuki Segawa
Chiaki Moriyuma
Ikehata, the mad old soldier
Prime Minister
Army Chief
U.S. Ship Commander
Major Spielberg
Godzilla
King Ghidora
Godzilla-Saurus
U.S. Navy Aide (as Jeff Berklund)
M102 Android
M101 Android
Newscaster
Fuyuki Takaoka the Flight Chief
Takeo Shimura
Morris / Morrys (uncredited)
Takehito Fujio (voice) (uncredited)
Underground shopping center patron (uncredited)
American serviceman (uncredited)
Lagos Island Japanese Army Sergeant (uncredited)