Peter Travers is astonished by Elizabeth Olsen's performance in Martha Marcy May Marlene, a new drama about a young woman who escapes a nightmarish cult. Olsen, the younger sister of Mary Kate and Ashley, is utterly captivating in this film – it's almost impossible to take your eyes off her when she's on screen. He also loves Felicity Jones' performance in Like Crazy, about a woman who struggles with a long distance relationship. Both actresses could end up getting Oscar nominations for these breakout roles, so Travers wants to know: What is your favorite debut role from an actor? Let him know in the comments below, on Twitter or via e-mail.