When foreman Frank (James Karen) shows new employee Freddy (Thom Mathews) a secret military experiment in a supply warehouse, the two klutzes accidentally release a gas that reanimates corpses into flesh-eating zombies. As the epidemic spreads throughout Louisville, Ky., and the creatures satisfy their hunger in gory and outlandish ways, Frank and Freddy fight to survive with the help of their boss (Clu Gulager) and a mysterious mortician (Don Calfa).

Suzy (Jessica Harper) travels to Germany to attend ballet school. When she arrives, late on a stormy night, no one lets her in, and she sees Pat (Eva Axén), another student, fleeing from the school. When Pat reaches her apartment, she is murdered. The next day, Suzy is admitted to her new school, but has a difficult time settling in. She hears noises, and often feels ill. As more people die, Suzy uncovers the terrifying secret history of the place.

A strange doorway appears in the basement of a furniture showroom.