Creature from the Black Lagoon is about a group of marine scientists in the Amazon who find a fossilized claw and try to dig out the rest of the prehistoric amphibious humanoid creature. During their expedition, they discover that the species did not die out 15 million years ago as they suspected; there is a lone survivor in the lagoon that starts to harass and kill them. It is unclear if the monster is trying to protect his habitat against the intruders, or if it is simply a violent, horny fish-man that enjoys killing men and capturing women. Many people love these classic Universal monster movies, extolling their ability to go against expectations by showing that the monster is capable of love and beauty. Unfortunately, this message was perfected 20 years prior in King Kong and is frankly not that novel or profound anymore.

IMDb link: http://www.imdb.com/title/tt0046876/