Inner Child (S01E15)

Just seconds before a building is demolished, a mysterious mute child (guest star Spencer List) who has been living alone underground is discovered. When the FBI's Fringe Division investigates, the boy forms an unspoken connection with Agent Olivia Dunham. Meanwhile, an especially gruesome serial killer (guest star Jeremy Shamos) resurfaces and showcases his "artistry" by displaying his work publicly. As the boy gradually assimilates into a new environment, Olivia and the team must race against the clock to prevent the mad man from further macabre acts. (Warner Bros. UK)