Dr. Worley investigates a 300-year-old witch's curse in the New England town of Devonsville. Three liberated, assertive women move into town, which angers the bigoted, male-dominated town fathers. One of the women is a reincarnation of the witch, who proceeds to exact revenge on them.

A group of young pilots in a remote region of the Canadian wilderness begin to hear strange reports over their radios about planes crashing, cars stalling and a deadly plague which has gripped the planet. It becomes clear that earth is in the midst of an invasion. The group of pilots decide to barracade themselves in a cabin deep in the woods and wait for their impending doom.