In the movie "Filthy Monster", a grotesque creature resembling a more sinister rendition of The Creature from the Black Lagoon, infiltrates a tranquil coastal town with a lighthouse. The apprehensive lighthouse caretaker is concerned about the well-being of his lovely adolescent daughter, therefore he offers provisions to the monster residing in a nearby cavern. As corpses begin to appear on the shore, the townspeople start to become alarmed.