El Monstruo de los Volcanes" is a cheesy Mexican monster movie about some Yeti-like creature living in the volcano's cave. The monster looks extremely funny as it resembles a polar bear. There are some atmospheric shots of volcano (Popocatepetl perhaps?) and laughable fight scenes, so if you are into 60's stinky cheese you won't be disappointed.
Review by HumanoidOfFlesh from the Internet Movie Database.