Radioactive waste dumped off the coastline creates mutant monsters. The beasts attack slumber parties, beaches, tourists, and terrorize a waterfront community as a scientist, his daughter, her boyfriend and the local police try to find a way to stop them.
The Horror of Party Beach is a 1964 American horror film in the beach party genre, directed and co-produced by Del Tenney. The film is described as "a take-off on beach parties and musicals", with film critics characterizing it as one of the worst films of all time.