A burned-out New York police detective teams up with a college psychoanalyst to track down a vicious serial killer randomly stalking and killing various young women around the city.
An archaeologist opens an Egyptian tomb and accidently releases an evil spirit. His young daughter becomes possessed by the freed entity and, upon their arrival back in New York, the gory murders begin.
A marine biologist, a dolphin trainer, a research scientist, and a local sheriff try to hunt down a large sea monster, a shark/octopus hybrid, that is devouring swimmers and fishermen off a south Florida coast.
