Two young boys sneak aboard a spaceship and find themselves whisked away to the mysterious planet Terra. There, they encounter Gamera's old foe Gyaos and two female aliens with a taste for human brains. Gamera must save the children and battle the new monster Guiron, whose entire body is a deadly living weapon.

"Controlled from the mysterious tenth planet, the immensely powerful Giant Demon Beast! The Earth is in danger! Launch the counter strategy, Gamera, you can do it!"

A FEW PICS