Watch Sarah Plays a Werewolf for Free: How to Stream the Movie Online at 123Movies. . 17-year old Sarah, filled with adolescent angst, is an extreme person who in her rehearsals with a theatre group is transformed until she is almost in a trance, and her performances at home or elsewhere verge on excess. A cold, intellectual father, a timid mother, a younger sister and an older brother who has left home complete the picture: a silent time bomb.