Walter’s plan to defeat the Observers is finally revealed, while a former ally reunites with the team after 21 years.
Walter drops acid and hallucinates some advice, including about the missing parts of his brain. It doesn't seem to help with The Plan. The rest of the team follow the radio signals on the device they retrieved, and get a surprise.
The plan starts to come together, and the team starts to fall apart.
Walter sidesteps the Observers. The team watches a tape. Olivia has a firearms malfunction. Peter makes a grave mistake.
Olivia and Peter cope in different ways.
An act of kindness by Peter draws attention to Etta. The Observers deal with an infiltrator and we learn of a resistance leader known as the Dove and coincidentally that that Phillip Broyles is working with the Observers.
Harvard is now a secret observer installation. But Walter remembers an entrance that will give him access to his lab and perhaps a way to recover his plan to rid the world of the Observers. Olivia gets a distasteful look at Observer interrogation methods as Etta questions a loyalist security guard in hopes of finding a way to restore power to the lab. As Olivia and Etta disagree on how to dispose of their captive they gain a greater appreciation of each others character.
In the year 2036, Peter, Astrid, Walter, and Etta set out to find Olivia and free her from amber. Once they do, they discover she holds the key to finding the plans for a weapon to defeat the Observers... but Walter is captured and interrogated for the same information.
People are dying simultaneously in both universes from the same cause. Walter crosses over to help Fringe Division - Fauxlivia, BBroyles, Agent Lee and Astrid2 - catch whoever is experimenting with the Universes. And Walter references Sherlock Holmes (who?) to help them find the mole.
Agent Lee feels out-of-sorts with all the changes going on around him, and decides to take a working vacation on the Other Side. There, he faces an existential dilemma: is it your environment, your upbringing, or your decisions that make you who you are?
A man on a passenger plain gets increasingly agitated, and engages in drug seeking behavior. Then he transforms into a hideous beast. Peter swears he's seen this before (as have we?), but something's a little .... off.
A girl with the ability to predict the deaths of those around her pops up on the Fringe team's radar. Olivia wants to know if what the bald man said would happen, while Peter has to help Walter get his confidence back.
The team hunts a .... ghost? No, not a ghost, as ghosts don't bleed. Massive Dynamic is implicated in some ethically-challenged medical testing, and swears it's all in the past.
The Fringe team, with the help of Peter, investigate a series of time-loop anomalies. The patter leads them to an electrical engineer married to a theoretical physicist.
Peter gets interviewed and does some hobby electronics work. Nina Sharp shares childhood memories with her foster daughter. Olivia and the team chase down a new kind of shapeshifter.
A mysterious force follows Olivia around. Walter screws up his courage to the sticking place. The Corteixphan Kids stage a reunion. Nina Sharp shows her mothering side. Peter makes a splash.
A boy makes a friend.
Agent Lincoln Lee is introduced to the team via the unnerving death of his partner. Olivia and Fauxlivia snipe at each other while trading secrets. Walter is (justifiably?) paranoid about Walternate. And the Observers discuss Mr. Not-Appearing-In-This-Episode. Redverse? Blueverse? Welcome to the Amberverse.
Peter steps into the Machine, and wakes up in front of a memorial to September 11 ... that was dedicated in 2021.
Olivia gets a shock. Walter orders up a megadose of his favorite hallucinogen. Peter responds to Broyle's Bald of Awesome. Peter and Walter have an animated conversation.
Olivia goes to the doctor. Lincoln and Charlie catch a cab. EvilBrandon is evil.
William Bell gets Olivia involved in a timeshare scheme. A woman fails to commit her own suicide.
The Fringe team attempts to find out what process enables people to become lighter than air and float. Peter and Olivia deal with trust issues in their relationship, while Walter becomes increasingly obsessed with retrieving William Bell's consciousness from beyond the grave - and repairing the damage he's done.
It's 1985: Peter goes for a walk and Olivia takes a test.
In which Walter declares ghosts are beyond the bounds of possibility, Amber within the bounds of possibility, and everyone gets all quantum entangled up in each other.
Col. Broyle's absences leads to Lincoln's promotion. Fauxlivia reunites with her boyfriend at the Empire State Building airship dock, where they find a sheep parasite that was thought to have died out when they did. Someone is running tests again, and Walternate faces a difficult ethical decision from B-randon.
A very polite, well-dressed gentleman keeps apologising to people for doing dreadful things to them, and the Fringe team - including Olivia, now returned from the Red Universe - have to figure out what he's up to. Walter gives Peter some human relations advice for a change. Olivia has to confront the knowledge that everyone seems to have accepted Fauxlivia in her place, including Peter. Sometimes the whole is greater than the sum of its parts.
Late night phone call — Να είναι καλύτερο άνθρωπο από τον πατέρα του — extraction needed — the wrong laptop — Brandon asks for some spare parts — the temptress and her vagenda — pastry seductions and epiphanies — we need heroes like you — plea for help — a moral dilemma and a decision — meanwhile, a hostage situation at Penn Station — something more, in photos — just relax, no pressure — swapsies — late to work — payback.
A dramatic haircut — close your eyes and count to three — breakfast with Henry — the Candyman can — growing suspicions — sucking the life out of them —plagiarising Aeschylus — previous victim — red vines? — a walk on the beach — two men or one? — abducting children for God — I'm with the FBI — Broyles won't forget — a man with a boat — teaching lessons — more suspicions — a night swim — passing on a message — Casablanca? Didn't that have Reagan in it? — still more suspicions.
Olivia takes the red pill. Flies in amber can't get out, can they? A short history of amber. An earth-shattering kaboom. Good twin, bad twin. A brief holiday. More red pills and childhood reminiscences. The plot thickens. "Only you can save yourself." Snowglobes and a birthday phone call.
Transactional needs — lemonade entrepreneurs — it's in the eyes — God doesn't need pants — searching for treasure — nice monsters — talking to the dead — animal crackers should have dinosaurs — an awkward lift encounter — time to move on — vacuum cleaners — crossing the line.