The Beast Within (1982)

In The Beast Within, a woman is raped on her wedding night by a mysterious creature. Years later, she gives birth to a son who begins to show signs of a twisted and violent nature. As the boy grows older, the small town he lives in is plagued by a series of brutal murders, and it becomes clear that there is a connection between the boy's violent tendencies and the creature that attacked his mother. With the help of a young doctor, the boy's father must uncover the truth behind their family's dark secret before the creature strikes again.