Oops, posted this early. Consider it tomorrow’s (the 30th) MotD.
In 1959 Gene Corman, Roger’s brother, produced a low budget monster movie called Beast of Haunted Cave. It was written by Corman’s pal and regular coworker Charles B. Griffin. Two years later, in 1961 (yes, it’s right, I used a calculator), Roger decided that only chumps pay for a brand new script, so he had Griffin rework the general plot to make it an island crime / horror picture. Corman’s version is also, unsurprisingly, a bit more satirical. Both movies have great cheapie monsters, though. Of course, this one here was featured in the opening credits of the Fox sitcom Malcolm in the Middle.
Corman’s other two films that year were the sword and sandals flick Atlas and the second of his Poe series (and possibly my favorite) The Pit and the Pendulum.