Gamera vs. Guiron (ガメラ対大悪獣ギロン
Gamera Tai Daiakujū Giron?
, Gamera vs. Devil Monster Guiron, released in the U.S. as Attack of the Monsters), is a 1969 kaiju film, the fifth entry in the original Gamera series.
Guiron is an alien monster who normally traverses on all fours, but can also assume a bipedal stance. He is an unusual looking creature, with tough gray skin, a small mouth, sleepy looking eyes and a low, groaning bellow. The most unusual feature Guiron's anatomy, however, is the gigantic blade that he sports on his head, which is nearly as long as his body.
Guiron is mostly a melee oriented kaiju, attacking opponents with his blade. Indeed, this blade is so sharp that it can even cut through Gamera's shell. The blade also has a reflective surface that can send an enemy monsters's beam attacks back at its opponent. In addition, there is a circular indent on either side of the blade. Housed within are shuriken that it can apparently launch with some kind of psychokinesis.
Guiron acted as the guard dog of two brain-eating space women, the last of a dead civilisation on the planet Terra. The aliens guided him with a mind control device. Guiron proved his combat prowess by effortlessly defeating Space Gyaos, reflecting the flying creature's sonic beam and literally slicing it to pieces with his blade. Guiron later fought Gamera, and nearly killed him. Gamera eventually managed to defeat Guiron by flipping him upside down (his blade stuck in the earth) then igniting a missile that had gotten stuck in his circular indents, blowing his head off and killing him.