Three children find a flying saucer and are taken to a planet on the opposite side of the Sun, where they're hypnotized by two women with Midwestern accents. The women want to eat their brains, but Gamera, the heroic turtle, rescues them while fighting a monster with a giant knife nose, Guiron.

Gamera vs. Guiron
Gamera embarks on a perilous quest to rescue two innocent children from the clutches of an alien force that seeks to exploit their purity for its own nefarious goals.