After a daring escape from a psychiatric hospital, the Stepfather (Terry O'Quinn), assumes a new identity and sets out in search of another family to mary into - and kill. He finds the perfect victims: attractive, recently divorced Carol Grayland (Meg Foster) and her teenage son Todd (Jonathan Brandis). Posing as a warm and caring family therapist named Gene, he appears to be the ideal second husband and father for these two lonely people. But Carol's best friend Matty (Caroline Williams) suspects Gene is too good to be true. And When Carol's first husband (Mitchell Laurence) returns to attempt a reconciliation, he triggers Gene's fear of discovery, sending him off on a psychotic killing spree. Gene secretly eliminates everyone who stands in his way, until the day arrives to marry Carol - one of the most unforgettable - and horrifying wedding days ever filmed.