Complete story — includes the ending
Strange physical behavior, including the deaths of six partygoers, in an apartment building leads Walter to believe that the same damage to the fabric of space-time occurring in the parallel universe is occurring in the prime one, and with Massive Dynamic's help, prepare a means to encase the building and surrounding area in the amber -like substance they had previously encountered. Olivia discovers that a widow, Alice, has an emotional quantum entanglement with the doppelganger of her deceased husband, Derek, that is keeping a crack between the universes open. With Olivia and Peter's help, Alice is able to recognize that the man she is seeing is not her husband, severing the ties between them and closing the crack just before a singularity developed. Olivia and Peter finally work through their relationship and spend the night together, while Walter worries that he was moments away from performing the same actions that Walternate had to do in the parallel universe to save it.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Fringe season 3. HTML formatting and reference markers removed. · Content license