Julia Roberts and "Room" breakout star Jacob Tremblay are set to star in the film adaptation of R.J. Palacio's best-selling novel "Wonder" at Lionsgate and Mandeville. Tremblay will play Auggie Pullman, a young boy who was born with a facial deformity. For the first time, Auggie is going to a mainstream school, starting the fifth grade at Beecher Prep.