The Courtship of Wyatt's Father

A Darklighter named Damien, accidentally sends both Leo and Piper to the Ghostly plane, leaving Phoebe and Paige to believe that they are dead. Unbeknownst to everybody, Gideon has made a deal with the Darklighters to get Leo out of the way. Meanwhile, Chris begins to disappear and reveals that he must be conceived before the night is over or he will vanish forever.