Keye Luke
Shigeru Kawamura / Sunagawa / Toji (voice)
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A mining engineer investigates the deaths of his colleagues, discovering prehistoric nymphs and a creature capable of flying - and wreaking havoc - at supersonic speeds.
Shigeru Kawamura / Sunagawa / Toji (voice)
Kiyo / woman outside hospital / female honeymooner (voice)
Dr. Kyuichiro Kashiwagi / Izeki / male honeymooner (voice)
Nishimura / Suda / Dr. Tanaka / Air Force officer / Kitahara (voice)
Air Self-Defense Force commander / Air Force pilot / newsreader (voice)
Osaki / Professor Minami / hotel manager / farmer (voice)
Otami (voice)
Narrator
Rodan / Meganulon (uncredited)
Shigeru Kawamura
Kiyo
Dr. Kyuichiro Kashiwagi