Akira Kubo as Kenji Murai - Professor

Kumi Mizuno as Mami Sekiguchi - Singer

Hiroshi Koizumi as Naoyuki Sakuta - Skipper

Kenji Sahara as Senzô Koyama - Sailor

Hiroshi Tachikawa as Etsurô Yoshida - Writer

Yoshio Tsuchiya as Masafumi Kasai - Owner

Miki Yashiro as Akiko Sôma - Student

Takuzō Kumagai as Doctor (as Jirô Kumagai) (uncredited)

Yutaka Oka as Doctor (uncredited)

Keisuke Yamada as Doctor (uncredited)

Akio Kusama as Police Personnel (uncredited)

Kazuo Higata as Police Personnel (uncredited)

Katsumi Tezuka as Police Personnel (uncredited)

Haruo Nakajima as Matango

Hideyo Amamoto as Skulking Transitional Matango (uncredited)

Tokio Ôkawa as Matango

Kōji Uruki as Matango

Masaki Shinohara as Matango

Kuniyoshi Kashima as Transitional Matango (uncredited)

Toku Ihara as Transitional Matango (uncredited)

Mitsuko Hayashi as Nurse (uncredited)

Tsurue Ichimanji as Nurse (uncredited)