At Angel
Season 5
The medallion appears at Wolfram & Hart, and with it comes Spike who is suddenly alive again - well, at least he exists, but until Fred is able to figure something out he is a ghost and destined to annoy Angel.
But, of course, there's a twist. The old Shanshu prophecy, which states that the vampire with a soul will become human again, isn't correct anymore - there are two ensouled vamps now.