John Crichton Peggy Sue

John Crichton post-PKW timetravels into his younger body right before he was originally shot through a wormhole, and has to decide between staying on an Earth that isn't home any more (and just doesn't fit), and going to the wormhole to strangers in friends bodies to try to change them into the friends he had had when he knows he can't do things the same. Either way, he's changed- he's not a naive scientist/pilot of Earth any more, but a hardened family man of the Uncharted Territories.