No one's ever really gone in the Sterling Cooper universe. Season one beatnik mistress Midge popped back up in season four, teaching us all a valuable lesson about the costs of heroin abuse. Duck Phillips was very present in seasons two and three, sort of faded out, and suddenly reappeared this season. Freddy Rumsen reemerged after a years-long absence. Paul Kinsey vanished and then reappeared as a Hare Krishna, with poor, dopey Harry along for part of the ride. Glen Bishop is never far from Sally's heart. Even the marginal Danny showed up again this week, and he was only on four episodes. All of this points to one question that hangs over the final three episodes of this season: Where is Sal?