Season 5: Episode 18

6/6

The Werewolf Transformation

Leonard (Johnny Galecki, center) is a witness as Sheldon's (Jim Parsons, right) life is turned upside-down after his barber gets sick. Meanwhile, astronaut training causes Wolowitz to rethink his decision to go into space, on THE BIG BANG THEORY. Photo: Michael Yarish/Warner Bros. ©2012 Warner Bros. Television. All Rights Reserved.