Akira Takarada

Lt. Commander Jiro Nomura

Mie Hama

Madame Piranha

Rhodes Reason

Commander Carl Nelson

Linda Miller

Lieutenant Susan Watson

Hideyo Amamoto

Dr. Who

Yoshifumi Tajima

Henchman

Ryuji Kita

SDF General

Ikio Sawamura

Native

Naoya Kusakawa

Haruo Nakajima

King Kong

Kei Taguchi

(voice)

Osman Yusuf

Submariner (uncredited)

Tadashi Okabe

Soldier (uncredited)

Yasuhisa Tsutsumi

General (uncredited)