A nuclear leak creates a mutant Slithis sea monster, which terrorizes the variety of pets, winos, and hippies who hang around Venice, California.

When Tommy was a boy, he saw his grandpa, the leader of a vicious satanic cult, murder his father in a brutal ritual on Halloween night. Now he is 18, and grandpa is ready to indoctrinate him into the ways of the black arts.

A notorious bank robber kills his wife and flees the police, only to be captured by a mysterious group of figures in an abandoned town. His beautiful daughter, Lila Lee, receives a letter stating that her father is near death and that he needs to see her. Sneaking away at night from her minister guardian, Lila embarks on a terrifying journey...