Creature From The Black Lagoon

The Creature Walks Among Us (1956)
The third film in The "Creature From The Black Lagoon" franchise sees the Gill Man suspicious turned into an air-breather by a mad scientist.

Creature Feature: 60 Years of the Gill-Man (2014)
This movie documents the era surrounding the creation, marketing and distribution of the influential horror film, "Creature From the Black Lagoon," and the two sequels that followed. Flash forward 60 years later, and we see how the legion of fans continue to grow for this classic horror character, and how the movie is still relevant today.

Creature from the Black Lagoon (1954)
When scientists exploring the Amazon River stumble on a “missing link” connecting humans and fish, they plan to capture it for later study. But the Creature has plans of his own, and has set his sights on the lead scientist's beautiful fiancée, Kay.