Gamera: Super Monster (1980)

"A titanic struggle for supremacy as starship Zanon invades the planet Earth!"

Plot Summary

As a massive alien craft heads to Earth to do evil, three good and powerful superwomen befriend a young boy who has a special connection to Gamera. The alien Zanon launches a battery of familiar foes against Gamera, who might have to give the ultimate sacrifice to defeat the alien invader.