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. It was one of five Gamera films to be featured as episodes of movie-mocking television show Mystery Science Theater 3000.