Carter and Joe only got together in fake cyber world created by this seasons villain.
Did you watch the ending of premiere?
On Fringe, it looks like they rebooted the show into a Terminator type scenario.
Oh oh OH! Yeah!
The evil doctor has them all under her control.
Funny, I had forgotten about that. LOL!!!
Well actually, Dr. Beverly Barlowe has been the back story villain since the first episode.