Keye Luke
Shigeru Kawamura / Sunagawa / Toji (voice)
Aya Oyama
Kiyo / woman outside hospital / female honeymooner (voice)
George Takei
Dr. Kyuichiro Kashiwagi / Izeki / male honeymooner (voice)
Paul Frees
Nishimura / Suda / Dr. Tanaka / Air Force officer / Kitahara (voice)
Marvin Miller
Air Self-Defense Force commander / Air Force pilot / newsreader (voice)
James Yagi
Osaki / Professor Minami / hotel manager / farmer (voice)
Haruo Nakajima
Rodan / Meganulon (uncredited)
Kenji Sahara
Shigeru Kawamura
Akihiko Hirata
Dr. Kyuichiro Kashiwagi
