Steve Martin
Dr. Yamane
Emiko (as Momoko Kochi)
Ogata
Dr. Serizawa
Hagiwara
Dr. Tabata
Seiji
Shinkichi
Dr. Tabata's Assistant
President of Company
Tomo Iwanaga - Security Officer
George Lawrence (uncredited)
Unidentified Character (voice) (uncredited)
Police Officer at Airport (uncredited)
(uncredited)
Ogata / Serizawa (voice) (uncredited)
Radio Operator (uncredited)
Dale Ishimoto (uncredited)
JSDF with Spotlight - Leader of the Crowd Escaping (uncredited)
Otoshima Islander (uncredited)
Old Man on Hill on Oto Island (uncredited)
The Boy's Mother (uncredited)
Man in Line at Airport (uncredited)
Activist (uncredited)
Godzilla (uncredited)
Chief of Emergency Headquarters (uncredited)
Man on Boat (uncredited)
Mayor Inada (uncredited)
Tokaido Line Driver (uncredited)
Dr. Yamane (voice) (uncredited)
Japan Coast Guard Officer / Shikine Newspaper Reporter (uncredited)