Destroy All Planets (Gamera tai uchu kaijû Bairasu) (1968)

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Gamera vs. Viras - Wow. lol, this movie is really bad... but in an entertaining way. There is about 8 minutes of stock footage, but I didn't really care. The battle scenes at the end were probably the highlight for me. 6/10

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.