Will an unexpected hero make his big debut in Thor: The Dark World?Alasdair Wilkins9/10/12 9:00am661EditPromoteDismissUndismissHideGo to permalinkRian Johnson explains exactly how time travel works in Looper. James Cameron reveals a crucial detail about Avatar 4. Joel Wyman maps out Fringe's final season. Karl Urban talks Dredd and Star Trek. Plus a trio of Doctor Who trailers!