Airdate: 27 April 2012, Watch  Fringe “World’s Apart” Season 4, Episode 20 Set in Boston, the FBI’s Fringe Division began when Special Agent OLIVIA DUNHAM (Anna Torv) enlisted institutionalized “fringe” scientist WALTER BISHOP (John Noble) and his globe-trotting, jack-of-all-trades son, PETER (Joshua Jackson), to help in the investigation of an airline disaster that defied human logic. [...]