As alien invaders plot to conquer the Earth, two Boy Scouts steal a mini-submarine and discover Gamera in their midst. Transported to the alien's spaceship, the Scouts are menaced by the evil inhabitants, including Viras, a squid-like monster that grows to colossal size to battle Gamera.
as Scout Master Mr. Shimida
as Masao Nakaya
as Jim Morgan
as Mariko
as Dr. Dobie
as Self-Defense Force Commander
as Junko Aoki
as Masako Shibata
as Masao's Father
as Jim's Father
as Jim’s Mother
as Doctor 1
as Doctor 2
as Doctor 3
as Doctor 4
as Doctor 5
as Boss (voice)
as Gamera
