
In an effort to find an economic means of purifying salt water, a joint U.S.-Japanese military command is set up on an isolated Japanese island where an unusual salt water lake is situated. However, their purifying experiments arouse the prehistoric monster Obaki from hibernation at the lake's bottom, and it proceeds to attack Japan. Although made by a U.S. independent film company, this film was based on a Japanese Toho monster film of 1958, "Daikaiju Varan", from which all of the monster effects scenes and a few incidental dramatic shots were edited into it.
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Myron Healey as Cmdr. James Bradley

Tsuruko Kobayashi as Anna

Clifford Kawada as Capt. Kishi

Derick Shimatsu as Matsu, the boy

Koreya Senda as Dr. Sugimoto

Kōzō Nomura as Paul Isoh

Ayumi Sonoda as Shidori Isoh

Fumito Matsuo as Paul's Friend

Akihiko Hirata as Dr. Fujimora

Fuyuki Murakami as Dr. Majima

Yoshio Tsuchiya as Military Officer Katsumoto

Minosuke Yamada as Secretary of Defense

Hisaya Itō as Ichiro

Yoshibumi Tajima as Captain of Uranami

Nadao Kirino as Yutaka Wada

Akira Sera as Village High Priest

Akio Kusama as Military Officer Kusama

Noriko Honma as Ken's Mom

Akira Yamada as Issaku

Fumindo Matsuo as Horiguchi

Yoshikazu Kawamata as Jiro

Yasuhiro Shigenobu as Sankichi

Shōichi Hirose as Fisherman

Takashi Itô as Ken

Hideo Shibuya as Cameraman

Toshitsugu Suzuki as Fisherman

Haruo Nakajima as Varan

Katsumi Tezuka as Varan

George Sasaki as Soldier
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