Five vacationers and two crewmen become stranded on a tropical island near the equator. The island has little edible food for them to use as they try to live in a fungus covered hulk while repairing Kessei's yacht. Eventually they struggle over the food rations which were left behind by the former crew. Soon they discover something unfriendly there...
Kenji Murai - Professor
Akira Kubo
Mami Sekiguchi - Singer
Kumi Mizuno
Naoyuki Sakuta - Skipper
Hiroshi Koizumi
Senzô Koyama - Sailor
Kenji Sahara
Etsurô Yoshida - Writer
Hiroshi Tachikawa
Masafumi Kasai - Owner
Yoshio Tsuchiya
Akiko Sôma - Student
Miki Yashiro
Doctor (as Jirô Kumagai) (uncredited)
Takuzō Kumagai
Doctor (uncredited)
Yutaka Oka
Doctor (uncredited)
Keisuke Yamada
Police Personnel (uncredited)
Akio Kusama
Police Personnel (uncredited)
Kazuo Higata
Police Personnel (uncredited)
Katsumi Tezuka
Matango
Haruo Nakajima
Skulking Transitional Matango (uncredited)
Hideyo Amamoto
Matango
Tokio Ôkawa
Matango
Kōji Uruki
Matango
Masaki Shinohara
Transitional Matango (uncredited)
Kuniyoshi Kashima
Transitional Matango (uncredited)
Toku Ihara
Nurse (uncredited)
Mitsuko Hayashi
Nurse (uncredited)
Tsurue Ichimanji