When a rare species of butterfly is found in a mysterious valley in Japan, a pair of entomologists go to investigate and find more. They discover Varan, a giant monster, who decides to leave the valley and head straight for Tokyo.

Cast: Kōzō Nomura, Ayumi Sonoda, Koreya Senda, Akihiko Hirata, Fuyuki Murakami, Yoshio Tsuchiya