The Twilight Zone (1985)

In 1916 a girl and a young man from a reformatory for wayward boys fall in love and try to get away from her father, the superintendent. He finds out and doesn't approve of their love, locking away his daughter and punishing the boy. With the help of a wandering vagrant the girl finds a way to use a book to transfer both her and the boy into a primordial world where they become wolves and can live free and together.