 Olivia is returned to her universe, but does not remember the details of her meeting with Bell in time to stop the shapeshifters from succeeding in recovering Newton's cryogenically frozen head, and revive Newton.Headed by Newton, the shapeshifters start tracking down and extracting pieces of brain tissue from three separate mental patients.Knowing that the three pieces were once taken from Walter's brain and when reinserted, they will cause Walter to remember how to open the gateway between the universes.