Gamera vs. Guiron (ガメラ対大悪獣ギロン, Gamera Tai Daiakujū Giron, Gamera vs. Giant Evil Beast Guiron, released in the U.S. as Attack of the Monsters), is a 1969 kaiju ("monster") genre 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.