Frankie Sakai as Senichiro 'Sen-chan' Fukuda

Hiroshi Koizumi as Dr. Shin'ichi Chûjô

Kyōko Kagawa as Michi Hanamura

Jerry Itō as Clark Nelson

Ken Uehara as Dr. Harada

Emi Ito as Shobijin (Twin Fairy)

Yumi Ito as Shobijin (Twin Fairy)

Takashi Shimura as News Editor

Akihiro Tayama as Shinji Chûjô

Akihiko Hirata as Doctor

Tetsu Nakamura as Nelson's Henchman

Obel Wyatt as Dr. Roff

Seizaburō Kawazu as General

Yoshibumi Tajima as Military Advisor

Robert Dunham as Rolisican Official

Kenji Sahara as Helicopter Pilot

Yoshio Kosugi as Ship Captain

Ren Yamamoto as Ship Survivor

Haruya Katō as Ship Survivor

Shōichi Hirose as Dam Worker

Hiroshi Takagi as Nelson's Henchman

Yasuhisa Tsutsumi as Woodcutter

Teruko Mita as Rest House Owner's Wife

Kōji Iwamoto as Nelson's Henchman

Mitsuo Tsuda as Surveyor

Masamitsu Tayama as Shinji Chûjô

Toshio Miura as Nelson's Henchman

Tadashi Okabe as Surveyor

Akira Wakamatsu as Nelson's Henchman

Yutaka Nakayama as Radio Communicator

Osman Yusuf as Nelson's Rolisican Henchman

Akira Yamada as Island Worshipper

Kôji Uno as Police Officer

Wataru Ōmae as Official

Toshihiko Furuta as Dam Worker

Keisuke Matsuyama as Shipmate

Takeo Nagashima as Island Dancer

Mitsuo Matsumoto as Police Officer

Hideo Shibuya as Journalist

Kazuo Hinata as Official

Shigeo Katō as Dam Watchman

Rinsaku Ogata as Ship Survivor

Yutaka Oka as Captain of Transport

Kô Hayami as Island Dancer

Hiroyuki Satake as Police officer

Kazuo Imai as Announcer

Hiroshi Akitsu as Nelson's henchman

Akio Kusama as Surveyor

Gorô Sakurai as Member of Task Force

Haruo Nakajima as Mothra

Katsumi Tezuka as Mothra