S4E10 Déjà Vu

The Chans arrive at an old temple in search of Daolon Wong, who has been released for good behaviour and seeks to use the magical Deja Vu stone to return to the past and reclaim his lost power. Jackie and Wong both end up reliving their pasts, until Jackie gets the stone and Wong is captured by the past Dark Hand. Jackie is about to undo the future by sending Jade home the day she arrives, but realizes what a help she has been.