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Message: <blockquote data-quote="LightPhoenix" data-source="post: 5553587" data-attributes="member: 115">A couple other important points fba827 missed:[sblock]Peter initially destroys the Red Universe, however they learn the two universes are linked.  Destroying the Red Universe triggers the irreconcilable breakdown of the Blue Universe... hence the title of the episode.  A wormhole opens in... Central Park, I think, that leads to the Paleozoic era.  Future Peter and Walter realize that they built The Machine, and sent it back in time through the wormhole.  Hence, Future Peter/Walter/Astrid/Ella are the "First People."  It also explains why it's keyed to Peter and Olivia, and why there are drawings.However, Walter explains that he can't simply not build it, due to temporal paradox.  However, they imbed in The Machine the ability to show Present Peter this Future (the Grey Universe).  So Peter instead bridges the two universes, hoping they can work together to stop the rifts.As a consequence, Peter seemingly ceases to exist in both universes, and never did exist.  However, at least the Observers remember him.Finally, we learn that there's still a problem with the Red Universe, despite Peter not existing.  While Walternate still blames Walter, the truth may be that Walter kidnapping Peter may not have been the event that started the Red Universe breakdown.[/sblock]</blockquote>