We already know that the primal cause was the tear Walter made when he went over to kidnap Peter. Tonight we find that sheer missing someone - when a wife loses her husband on this side, the same husband loses his same wife on the other side, after both couples have been married a lifetime - can create a "soft spot" in the space-time fabric separating the universes, leading to a destructive vortex.
One way of bandaging the breach, as we've seen on the other side, is to freeze or suspend it in amber. But this takes not only the hole off the table, but every living human being inside the amber (which is why the other side declares them dead).
Walter has just about invented the amber over here, and gives it to Broyles to use, but Peter and Olivia have perhaps come up with another solution: if they can get the widow (given a great emotional rendition by Phyllis Somerville) over here to realize her husband on the other side is not really her husband, then maybe she'll give him up, which will heal the breach in the universes. Peter and Olivia's best persuasions don't seem to be working, but when the alt-husband mentions something about children - the couple never had kids over here - that makes the widow realize that she has not really been in touch with her husband, after all.
The breach repairs, and that's about the happiest ending we'll see on Fringe, with the additional plum that Peter and Olivia end up making love.
But a final scene on other side with Fauxlivia and her boss going to their version of the couple, with the husband not the wife alive (and perhaps thinking Fauxlivia looks familiar, since he just saw Olivia through the rift), reminds us that Fauxlivia is pregnant with Peter's baby ...
See also Fringe 3.1: The Other Olivia ... Fringe 3.2: Bad Olivia and Peter ... Fringe 3.3: Our/Their Olivia on the Other Side ... Fringe 3.5: Back from Hiatus, Back from the Amber ... Fringe 3.7: Two Universes Still Nearing Collision ... Fringe 3.8: Long Voyages Home ... Fringe 3.10: The Return of the Eternal Bald Observers ... Flowers for Fringenon in Fringe 3.11 ... Fringe 3.12: The Wrong Coffee ... Fringe 3.13: Alternate Fringe
See also reviews of Season 2: Top Notch Return of Fringe Second Season ... Fringe 2.2 and The Mole People ... Fringe 2.3 and the Human Body as Bomb ... Fringe 2.4 Unfolds and Takes Wing ... Fringe 2.5: Peter in Alternate Reality and Wi-Fi for the Mind ... A Different Stripe of Fringe in 2.6 ... The Kid Who Changed Minds in Fringe 2.7 ... Fringe 2.8: The Eternal Bald Observers ... Fringe 2.9: Walter's Journey ... Fringe 2.10: Walter's Brain, Harry Potter, and Flowers for Algernon ... New Fringe on Monday Night: In Alternate Universe? ... Fringe 2.12: Classic Science Fiction Chiante ... Fringe 2.13: "I Can't Let Peter Die Again" ... Fringe 2.14: Walter's Health, Books, and Father ... Fringe 2.15: I'll Take 'Manhatan' ... Fringe 2.16: Peter's Story ... Fringe 2.17: Will Olivia Tell Peter? ... Fringe 2.18: Strangeness on a Train ... Fringe 2.19: Two Plus Infinity ... Fringe the Noir Musical ... Fringe 2.21: Bring on the Alternates ... Fringe 2.22: Tin Soldiers and Nixon Coming ... Fringe Season 2 Finale: The Switch
See also reviews of Season One Fringe Begins ... Fringe 2 and 3: The Anthology Tightrope ... 4: The Eternal Bald Observer ... 7: A Bullet Can Scramble a Dead Brain's Transmission ... 8. Heroic Walter and Apple Through Steel ... 9. Razor-Tipped Butterflies of the Mind ... 10. Shattered Pieces Come Together Through Space and Times ... 11. A Traitor, a Crimimal, and a Lunatic ... 12, 13, 14: Fringe and Teleportation ... 15: Fringe is Back with Feral Child, Pheromones, and Bald Men ... 17. Fringe in New York, with Oliva as Her Suspect ... 18. Heroes and Villains across Fringe ... Stephen King, Arthur C. Clarke, and Star Trek in Penultimate Fringe ... Fringe Alternate Reality Finale: Science Fiction At Its Best
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