Complete story — includes the ending
In the parallel universe, Walternate activates his doomsday machine, triggering devastation in the prime universe. Nina finally tells Olivia that Sam Weiss is the one that wrote The First People but she discovers he has disappeared. Sam is seen performing experiments that show the prime universe is being torn apart. Peter realizes he has no choice but to enter the machine and try and break the circuit. However, the machine rejects him and knocks him unconscious. Sam finds Olivia at the hospital with Peter and asks her to trust him. Meanwhile, Fauxlivia resolves to save both worlds by trying to bring Peter back to convince the Secretary to stop the machine. She is prevented from entering the prime universe and imprisoned.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Fringe season 3. HTML formatting and reference markers removed. · Content license