Denning (March 27, 1914 – Oct. 11, 1998) had a long career in Hollywood before moving into TV (notably Hawaii Five-O) in the 1960’s.
He had starring roles in a number of Sci-Fi flicks including Unknown Island (1948), Day the World Ended (1955), Creature with the Atom Brain (1955) and Black Scorpion (1957), but he takes a bow here for playing the greedy Dr. Mark Williams in 1954’s, Creature from the Black Lagoon.