American crook Renzo Capetto sees a chance to make a bundle when a Caribbean island has a revolution. He plans to help loyalists (and the national treasury) escape on his boat, then kill the men and blame their deaths on a mythical sea monster. Trouble ensues when the real monster shows up! —IMDb
Roger William Corman (born April 5, 1926), sometimes nicknamed “King of the Bs” for his output of B-movies (though he himself rejects this as inaccurate), is an Academy Award-winning American producer and director of low-budget movies, some of which have an established critical reputation: his cycle of films derived from the tales of Edgar Allan Poe for example. Corman is also a sometime actor, taking minor roles in such films as The Silence of the Lambs, The Godfather Part II, Apollo 13 and Philadelphia.
Corman has apprenticed many now-famous directors, stressing the importance of budgeting and resourcefulness; Corman once joked he could make a film about the fall of the Roman Empire with two extras and a sagebrush. One of the most expensive films he produced was Battle Beyond the Stars. —Wikipedia
Why isn't this a better known cult movie? It is enjoyably goofy. "My real name is XK-150." "As an American gangster and gambler, you are naturally above suspicion."