Guiron

Guiron is the titular antagonist in the in the 1969 monster film ''Gamera vs Guiron. ''He is the giant monster who defends the planet Terra.

Role
Guiron first appears defending the planet Terra from an alien called Gyaos. Guiron brutally kills it by chopping it to pieces with the blade on his head (In the US release, it simply retreats after having its leg severed).

The last remaining survivors on Terra, Barbella and Florbella, capture the two child protagonists, Akio and Tom, intending on eating their brains and then to move to Earth to eat the humans there. The giant turtle-like kaiju, Gamera, arrives, but is attacked by Guiron, who knocks Gamera into the sea after a firce battle.

The children accidently release Guiron, who is no longer under the Terrans control. He even attacks the Terrans as they head for Earth in their ship, chopping the ship in half. Both survive, but Barbella is injured, so Florbella kills her. Gamera wakes up and fights Guiron. Gamera drives Guiron's head into the ground, and the boys fire a missile that kills Florbella. Guiron tries to fire it's sharp shurikens at Gamera, but he dodges, grabs the missile, and throws it at Guiron, blowing the monster into pieces, killing him.