Once the wormhole is stabilized by the red rocks from the mine, Michael would be sent through, to meet an agent to take him to the Norwegian scientist to stop the experiment that would be responsible for creating the Observers.

As they discuss this, Olivia (Anna Torv) is still concerned as to why Michael willingly let himself be captured previously and believes him to have expected to be rescued.

Captain Windmark, having discovered Broyles' alliance with the Fringe team, interrogates him about the recovery of Michael from a secured facility, believing him to be "The Dove", a mole for the underground.

Olivia looks to Michael to gain insight; he motions her to be quiet, during which Astrid comes up with the idea of using one of the Observer shipping lanes as their wormhole.

Walter and Astrid share an emotional moment with the hope to wake up back in the lab drinking strawberry milkshakes after all this ends.

Windmark gains the upper hand, but Olivia, under emotional duress from fighting for her daughter Etta, activates her latent Cortexiphan powers.

Time flashes back to 2015, where Peter, Olivia, and their young daughter Etta are enjoying a day in the park (as seen in "Transilience Thought Unifier Model-11" and throughout the season).

When Peter checks the mail, he finds an envelope addressed to him from W. Bishop, containing only a piece of paper with a drawn white tulip on it.

Of the past Fringe cases that the team uses against the Observers, these include the nematode worms, the radioactive isotopes, the parasitic cold slug, anti-gravity osmium bullets, the hallucinogenic drug that simulates deadly butterflies, and the skin-growth toxin.

Club gave the two-parter a collective grade of A−, stating that "typical of Fringe, it’s a mixed bag, with a little foot-dragging, followed by a bit of “wow,” and a not-so-surprising swell of emotion.

"[7] Ramsey Isler of IGN rated the last episode 8.6 out of 10, criticizing that some of the time travel elements were glossed over, but concluded the article by saying that " Fringe was never about answers.

"[9] Anthony Ocasio of Screen Rant stated that "the Fringe series finale managed to deliver a truly satisfying conclusion to those who followed the series from the beginning",[10] while Jeff Jensen writing for Entertainment Weekly said that "the fifth season was 'stolen time', to use Walter’s words, a generously bestowed bonus period that gave us 13 more hours with a 'favorite thing'.

"[11] Writing for The Huffington Post, Maureen Ryan said that she "knew better than to expect a finale that would truly hang together or satisfy on macro levels.

[12] The Hollywood Reporter emphasized that this "was the only way Fringe -- after five seasons, multiple universes and 100 episodes -- could end: a bittersweet footnote to a rollercoaster journey".

[13] Morgan Jeffrey of Digital Spy concluded his article by saying that "the nods to the past are sweet, but what any real Fringe fan wanted from these last episodes was a farewell to the characters we've come to love that feels emotionally satisfying - and on that level, this series finale more than delivers.