Undersea Kingdom (1936) is a Republic Pictures 12 chapter film serial released in response to Universal's Flash Gordon. It was the second of the sixty-six serials made by Republic. In 1966, the serial was edited into a 100-minute television film titled Sharad of Atlantis.

Ray "Crash" Corrigan was an American actor most famous for appearing in many B-Western movies. He also was a stuntman and frequently acted as silver screen gorillas using his own gorilla costumes.