Peter convinces Olivia and Lincoln to help him to go to the parallel universe to ask for help to Walternate to return to his timeline since Walter refuses to help him. They cross using the original device used by Walter and try to reach Walternate; however their plan fails and Lincoln is arrested by the Fringe Division. Peter succeeds to meet Elizabeth and her mother convinces Walternate to help Peter. However Walternate proves to Peter that he is not responsible for the shapeshifters. Further, he asks Peter to help him to convince the other universe that he is facing also problems with shapeshifters. Meanwhile the alternate Olivia and Lincoln decide to investigate Lincoln's information about a mysterious phone call.