- An incident occurs that bears remarkable similarities to an early case in the original time-line, though there are some notable differences. Olivia's memories of the new time-line continue to fade, and Broyles places her on temporary leave, but her memories of original case assist Peter and Lincoln. Lincoln gets infected with a virus and Walter must figure out a cure.—John W.
- When the passenger of a plane turns into a huge porcupine-like beast, the Fringe Division is assigned to the case. Peter recalls the case from his timeline but there are differences between the events. Olivia has memories from the original timeline forgetting many cases and even her family details and Broyles forces her to take a leave. However she secretly helps Peter and Lincoln in the investigation. She recalls the name of Bowman's partner, Daniel Hicks, and they head to his house. But Hicks has already transformed in a beast and injures Lincoln. Walter finds that he is infected by the mysterious virus and needs to find a means to save him. Meanwhile Peter and Olivia proceeds their investigation.—Claudio Carvalho, Rio de Janeiro, Brazil
- On an airplane, a man we've seen before writes that a technology is too good to be true. He gets a bloody nose and goes to the bathroom. He swabs his tongue, mixes it with something and the vial turns red and he anxiously goes out to tell a flight attendant that they have to sedate him now. (It's the same opening as episode 13 from season 1)
He locks himself in the bathroom and tells them not to let him out. There are guttural screams from inside. In the bathroom he twitches a few times. We know what's coming -- he's about to turn into a giant beast and bust down the door.
Except that when the air marshal knocks and tells him to come out, he calmly opens the door, unchanged.
On the ground, he talks to TSA, chalking it up to a panic attack.
They go through his checked luggage and he doubles over with another bloody nose. In his suitcase they find a kit with needles and tiny vials.
In the bathroom, the man twitches and checks his eyes. This time they're turning green. The TSA agents go to call the cops, and the man busts out as a giant spiny beast. Return of the werecupines!
Olivia talks to a psychologist, resenting that she's trying to convince an FBI shrink that she's fit for duty instead of being out there trying to catch David Robert Jones.
The shrink asks about her sister Rachel, who Olivia says moved to Chicago with her daughter Ella, in order to be closer to her ex-husband.
After, she goes to Broyles who tells her they don't know if she's fit or not. But Rachel is still married and has a second child, Eddie.
Forty percent of the information she provided was incorrect; she's not the agent they licensed.
Olivia comes home to Peter, who suggests they take a vacation if she can't go back to work. Peter gets called to a case.
At the lab, Lincoln mentions Vertus air and Peter guesses the flight number. Walter comes out with a box of birthday presents he bought each year for his dead Peter, including a bottle of beer for his 21st birthday. Peter gives him a hug.
Peter recaps his old case: Marshall Bowman was an undercover cop given a designer virus to rewrite his DNA and turn him into a giant werecupine. But the plane crashed and he was burned to a crisp. Astrid says that's the guy, but the flight didn't crash.
They watch TSA security footage of the giant werecupine attacking. At the scene, Marshall is a giant dead werecupine.
Peter talks to his sister, who saw him a week ago. Peter asks her about Marshall's notes that say "once you get started there will be no turning back."
Marshall worked in France at a bank, but retired from being a cop six years ago -- he probably was undercover. Peter remembers Marshall was working with a partner who nearly transformed, too. He can't think of the partner's name, but wonders if Olivia will know.
She does: Daniel Hicks.
On the drive there, Peter asks Lincoln if he wants to talk about Olivia. Lincoln sees the way Olivia looks at Peter and is happy to leave it at that. Peter says Lincolns a good guy, but Lincoln is clearly struggling.
They pull up to Daniel Hicks' house and Olivia is waiting.
Hicks isn't there, but they go in and look. The house is in shambles, the fridge is empty and the windows are blacked out and the lights don't work. There's a medical waste bag in the kitchen.
Lincoln realizes Olivia doesn't remember recruiting him for Fringe, the nights they met at the diner. We see a giant werecupine race by, but they don't.
Lincoln goes to inspect the house and gets thrown to the floor by it. Olivia fires but it gets away.
Back at the lab, Walter stitches up Lincoln's shoulder. Peter looks at Marshall's werecupine body. They think the rapid mutation must have killed him. They haven't made sense of the vials yet. They notice track marks and a tattoo.
Olivia apologizes to Lincoln for showing up at the house and letting him get hurt.
Astrid runs Conrad Etienne Moreau, a scientist whose name Olivia remembers from the first case, but he died five years ago. So if he's not the one behind it this time, who is?
Walter announces the tattoo is Sumerian. Peter remembers someone they can ask.
With Lincoln mid-suture, he stays behind while Peter and Olivia go talk to the ancient book seller Edward Markham. Peter doesn't expect him to remember them.
They open by asking for a rare science fiction book then mention Sumerian. They show him the tattoo. "Are you one of them?" he asks.
At the lab, Walter offers Lincoln peanut butter and bacon sandwiches. And then he casually mentions that Lincoln might be infected with the werecupine virus. He can't treat him until the virus take full hold, and then he's only 80% sure it'll work.
Back at the book sellers, they learn the tattoo means renewal or rebirth. Markham says there have been rumblings about a new cult out there obsessed with the guided evolution of man, mutation by design.
A woman comes home alone to her dark apartment. The werecupine is there. But when she sees it waiting in the dark she sympathetically says: "Oh baby, you're hurting."
She hugs it and injects him with something, telling him to think how special he's going to be, how special they're both going to be. "Like Adam and Eve," she says.
Peter, Olivia and Astrid mock the guided evolution chat rooms and Walter enjoys the family feel. Lincoln feels left out and waits to see if he's infected with werecupine virus.
Walter see a lab file cited on a chat room that he recognizes as a psychedelic product of he and William Bell from years ago.
Off to Massive Dynamic. Nina confirms it is one of theirs and checks their old project records. The contents have been erased. It was being overseen by David Robert Jones.
Back in the lab, Lincoln is chowing down on Walter's bacon. He has weird cravings, for onion rings and cheese cake. He stares longingly at Walter's love handles. Walter has an epiphany.
They come back and Walter excitedly announces that Lincoln is infected. But he'll be OK. He understands the creature was craving human fat -- that's what was in the bag, probably from lipsuction. Fat stores energy and energy is necessary for transformation.
They start to check plastic surgery centers for break ins. Peter wonders how the creatures get around without being seen.
Cut to the woman on a rooftop with her beast. He takes her gently in his arms and jumps off the building -- but then soars off into the night. A werecupine with wings.
Back in the lab, Walter makes Lincoln a mixture of wheat grass, penicillin, laxatives and mint to kill the after taste. He figured out the drugs Bowman had on him were to ensure the transformation doesn't occur too quickly. But they were in his checked bag.
Walter used Lincoln's infected blood to create a computer model to replicate the transformation. A werecupine takes shape on the computer screen.
Olivia and Astrid report there was a break in at a surgery center and bags of fat were stolen but now it's under lockdown. There are 45 others clinics nearby. The computer model finishes and they see wings.
They check to see how many clinics were in high rises. Just one.
Lincoln tells Peter he has to call Broyles for back up. Peter is debating how much trouble that will get Olivia in when she gets off the phone announcing she just spoke to him.
At the clinic, SWAT teams sweep through with night vision on. The beast is there but they don't see it sneak around in the dark.
Olivia and Walter wait at the lab, Olivia realizes werecupines are nocturnal, which is why Hicks' windows were blacked out.
Astrid tries to radio Lincoln but can't reach him. She calls Peter, telling him to turn on the lights to scare it out of hiding.
Peter flips the lights just as the beast jumps out at Lincoln. It's scared off him and Lincoln is able to get off a few shots, killing it.
He's taking a deep breath when the wife jumps out and attacks him. She has the drop on him and he's losing, when Peter shoots her.
She lives, and cries over her dead beast husband.
Back at the lab, Walter opens the presents he got for Peter. He's excited to play with them with Peter.
Olivia reports the wife is OK and the hospital is treating her with Walter's cure. But she has no idea who made the virus.
Olivia wonders where David Robert Jones is recruiting these people from. Walter says David Robert Jones has a God complex and is trying to control things like evolution.
Broyles stops by to talk to Olivia. She starts by apologizing and promising that she'll listen to him from now on.
He's been on the phone with his bosses for hours and they've decided that 60% of an Agent Olivia Dunham is still better than 90% of other agents. She's back in Fringe.
Elsewhere, Marshall Bowen's sister talks to her husband, who is having second thoughts. But she isn't. She thinks they can be children of the new world. He agrees and they do their injections. She has a Sumerian tattoo as well.
Cut to two beasts in cages, in a basement with other beasties from spiders, squids and all manner of new evolutionary weirdness. A man checks on the cages and walks up the stairs. They're on a giant freighter out in the middle of the ocean.
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