The Creature Walks Among Us (1956)

Director: John Sherwood
Cast: David McMahon, Gregg Palmer, James Rawley, Jeff Morrow, Leigh Snowden, Maurice Manson, Paul Fierro, Rex Reason

Synopsis:

Scientists surgically transform the Creature into an air-breather, but being able to live on land is not enough to make him comfortable with humans. Enraged, he turns his wrath on anyone who comes near as he desperately tries to return to the deep-water world where he truly belongs.