The film is about the adventure of the man named Gill-man in the human world. It seems that the adventure will be dangerous after he was arrested, where Jillin is taught by biology student Helen Dobson. It seems that things will turn out especially when the monster creature develops feelings with a human being in moments.
There's nothing particularly remarkable about it, and it plays out almost exactly how you expect it to, but as a monster matinee, you could do a lot worse.
If I ever watch this film again, I will time the sequences showing the creature swim underwater. Swim, swim, swim, swim, swim. Very repetitive and definitely not scary.