The wealthy patriarch of the Sinclair family lives in mortal fear of being buried alive due to a rare condition that causes him to sometimes appear lifeless. After his death, relatives learn that his will stipulates a strict series of orders that must be followed in order to receive their inheritance. The family refuses to comply and the patriarch returns from the grave to exact revenge by killing each of them in the way they fear most.

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.