Chiller exposing Lindsay Wagner to "the forces of darkness," last met in "Night of the Living Dead." Glen: Robin Thomas. Peter: Bruce Boxleitner. Maggie: Diahann Carroll. Dr. Hovde: Robert Prosky. Elena: Rita Zohar. Rick: Merritt Butrick. Dr. Morgan: Joanne Linville. Dr. Breedlove: Richard Fancy. Directed by Paul Wendkos.