Gamera 4: Truth (1970)

In this independently-produced sequel to "Gamera 3: Revenge of Iris (1999)", the monstrous Gyaos horde transforms into the hyper-powerful Albino Gyaos and kills Gamera, then setting its sights on the beleaguered Inspector Osako (Yukijiro Hotaru). However, a violent new Gamera appears - regenerated the Earth's mana - which takes on Albino Gyaos in a decisive final battle.