At the turn of the century, all of the Earth's monsters have been rounded up and kept safely on Monsterland. Chaos erupts when a race of she-aliens known as the Kilaaks unleash the monsters across the world.

Akira Kubo
as Katsuo Yamabe

Yukiko Kobayashi
as Kyoko Manabe

Kyôko Ai
as Kilaak Queen

Jun Tazaki
as Dr. Yoshido

Yoshio Tsuchiya
as Dr. Otani

Kenji Sahara
as Commander Nishikawa

Susumu Kurobe
as Kilaak Controlled Staffer (uncredited)

Hisaya Ito
as Major Tada

Yoshibumi Tajima
as General

Nadao Kirino
as 1st Detective