A documentary about the original classic film. It includes interviews with the creators and participants of the film "Amphibian Man," rare footage, and the history of creation.

People living at a seashore town are frightened by reports of an unknown creature called "the sea devil". Nobody knows what it is, but it's really the son of doctor Salvator. The doctor performed surgery on his son and now young Ichtiander can live under water. This gives him certain advantages, but also creates a lot of problems.