Wikipedia
Gill-man
Gill-man, commonly referred to as the The Creature, is the lead antagonist of the 1954 black-and-white science fiction film Creature from the Black Lagoon and its two sequels Revenge of the Creature (1955) and The Creature Walks Among Us (1956).
Ricou Browning portrays the underwater Gill-man throughout the three films. On land, Ben Chapman plays the Gill-man in the first film, followed by Tom Hennesy in the second, and Don Megowan in the third.
The Gill-man's popularity as an iconic monster of cinema has led to numerous cameo appearances, including an episode of The Munsters, the motion picture The Monster Squad, and a stage show.