He also sent his Olivia, "Fauxlivia", to the prime universe, in Olivia's place, to engage the Fringe Division and assemble the prime universe's version of the device, while he studies Olivia's Cortexiphan-induced powers. By happenstance, Fauxlivia becomes pregnant with Peter's child, Henry, before being outed and extracted to the parallel universe. Walternate orchestrated acceleration of the pregnancy to gain a sample of the baby's blood, which he uses to activate the machine. Peter, with Olivia's help, enters the prime version of the machine, and experiences a vision of the future where the parallel universe has been destroyed and the same fate threatens the prime one, and learns the Machine is really a device created by Walter and his associates from this future, sent back in time purposely to relay this vision of the future to Peter. Recovering in the present, Peter alters his plan and uses the Machine to merge the two rooms, creating a bridge where inhabitants of both universes can solve their dilemma, before time is re-written so September (The Observer) doesn't save him and is forgotten by both Walter and Olivia. Season 4 begins in an alternate timeline, one in which September had failed to save the alternate version of Peter in 1985, according to the Observers. This creates a butterfly effect influencing the main characters' pasts but otherwise stabilizing both universes due to the creation of the bridge. Peter is pulled into this new timeline due to the actions of the alternate timeline's Fringe team, which includes Lincoln Lee (Seth Gabel). Peter initially works to return to his own timeline, fueled by fears that his memories are altering Cortexiphan-dosed Olivia's of this timeline, but after encountering a wounded September, Peter comes to learn that this timeline is truly his home, and both he and Olivia come to accept the change, rekindling their affair. September also reveals to Peter that the Observers needed to erase Peter's son, Henry, to assure their future will be created, though noting that Peter's future child with Olivia will be important. Meanwhile, in the present, William Bell has instructed David Robert Jones, alive in this timeline, to work with the parallel universe's version of Nina Sharp to synchronize the two universes, aiming to collapse them both and pave the way for a third universe under Bell's control, using Olivia's Cortexiphan powers to enable the collapse. The Fringe division is forced to close the dimensional bridge, but this fails to stop Bell's plan.