Directed by: Jack Arnold
Starring: John Agar, Lori Nelson, John Bromfield, Nestor Paiva
Factual error: The tank the creature's in has sharks and barracudas, salt water sea creatures, when he's said to be of fresh water origin.
Revealing mistake: You can see the stunt man playing Joe in the Creature's tank move when he's supposed to be dead.
Revealing mistake: Air can be seen coming out of the creature's head at one point in one of the tank scenes.
Lucas: I hope you ain't going to blow up my boat, Mr. Johnson. Like my wife, she's not much but she's all I have.
Trivia: In this 1955 horror film, Hollywood newcomer Clint Eastwood memorably appeared as a lab assistant (a speaking role) with a white rat in his pocket. Earlier the same day on a different set, Eastwood filmed his very first big-screen role as a jet fighter pilot (another speaking role) in the 1955 horror film "Tarantula," making it a big day for Clint Eastwood.