- The Fringe Division visits the Massive Dynamic to see the Doomsday Machine and the presence of Peter assembles the device. He is submitted to tests by Dr. James Falcon against Walter's will. Walter asks Nina to find William Bell's research since he wants to restore his brain to increase his IQ and help Peter. Meanwhile Broyles gives access to the main frame where the alternate Olivia's files are to help the investigation and they suspect there is a mole accessing the information. Soon they find that someone is killing the shapeshifters. Who might be the killer?—Claudio Carvalho, Rio de Janeiro, Brazil
- When the Fringe Team visits Massive Dynamic's assembly of doomsday device, Walter becomes greatly concerned for Peter's well-being, so he turns to Nina for added brain power to understand the relationship between Peter and the super-weapon. Meanwhile, the discovery of a dead body triggers an intense investigation.—Fox Publicity
- At a remote military-looking base, the Fringe team passes through security.
Nina Sharp meets them inside. A MD scientist named James Falcon tells her the machine isn't responding to any of the power sources they've tried.
Broyles reports they broke the encryption on Fauxlivia's laptop but haven't made any sense of the file.
They get a glimpse of the doomsday machine, which dozens of scientist are trying to figure it out. Walter realizes he's Falcon's boss.
They haven't found a way that the machine holds or transmits power. As they're standing there, there's an electromagnetic spike from the machine. Metallic objects start being drawn to it.
The team hasn't noticed yet and is wondering if the piece Fauxlivia took was the power source.
Suddenly, the machine starts moving. Peter gets a nose bleed. Peter realizes he triggered the machine.
(credits)
Peter returns home late at night to make himself a PB & J. He insists to Walter that he wasn't out. Neither of them can sleep.
Walter has read "The First People" a dozen times, without finding answers. Peter tells Walter that he can't protect him from everything.
At Massive Dynamic, Falcon wants to run a test on Peter to study his electromagnetic signature. Walter isn't thrilled. He tells Nina to fire Falcon, but she insists he's valuable.
Walter tells Nina about his attempts to regrow his brain cells. He wants William Bell's notes on what he did. He think he has to get smarter to figure out how Peter is connected to the machine.
Olivia checks on Peter. She says she called last night. He says he took a walk because "Walter was being Walter."
They start the test (like a CAT scan).
Massachusetts Port Authority A man notices all the koi in a pond are floating to the top, dead. He pokes around with a stick and sees a dead body.
Broyles visits Astrid in the lab. He tells her about the 300 pages from Fauxlivia's computer. Many of them are about her relationship with Peter. Astrid promises to look through them discretely.
Broyles gets called away.
Outside Peter's test at MD, Walter worries that Peter's heart rate is very high. Olivia gets called away.
At the pond, Broyles tells Olivia that the victim Michael Baird was surrounded by fish that died of mercury poisoning. He's a shape shifter and his data storage disc was removed.
Fauxlivia wonders if Walternate might have sent a "cleaner" over to take out people who knew what they were up to. Broyles has Astrid check if Baird's name is in the file. It is, on a long list of Port Authority employees. He tells her to shut down the mainframe.
Broyles thinks someone on their side could have told Walternate they were close to cracking Fauxlivia's computer. They think they have a mole.
At MD, Peter's test is done. Falcon tells him they didn't find anything weird, except his heart racing.
Walter comes in to tell Peter about the dead shape shifter and the mole. Falcon listens.
At the lab, Broyles says Walter and Nina are interviewing people who had access to Fauxlivia's files. Astrid says there are hundreds of names including cops and government employees. Olivia volunteers to help sift through the files and they have to admit that Fauxlivia wrote a lot about Peter.
At MD, Brandon the Super Nerd runs lie detectors on employees. It's a special test designed by William. Walter is envious he had the smarts to create it.
Nina tells Walter that William designed a serum that will regrow his brain material. She says there are three, one for him, a rat and a chimp. She wants to run tests to figure out which is which, but he takes a huge whiff, not wanting to wait. He assures her he's snorted worse.
Nina is worried about Peter. She suggests he talk to someone. Walter wants to help Peter himself. Peter and Olivia stand in awkward silence watching the lie detectors. Finally, she tells him she's not being useful and wants to read through Fauxlivia's files. He says Fauxlivia must have thought he was a fool and he doesn't want Olivia to see him like that.
Brandon finishes the tests. Olivia asks if they talked to Dr. Falcon, since he asked about it at the hangar. Brandon makes a call. Falcon left work early.
The FBI storms Falcon's house. They find Falcon dead inside, bleeding mercury. They find Falcon's name on Fauxlivia's computer.
Walter prepares to examine Falcon's body at the lab. He has a sudden craving for bananas. Walter asks what Fauxlivia thought about him. She thought he was kind and brilliant.
Walter bares his teeth at Falcon and realizes he's showing dominance. He coolly decides he must have whiffed the chimp DNA. He thinks his immune system will reject it as foreign and it'll go away. Walter finds blood on Falcon's hand.
At the crime scene, Olivia tells Peter she's sorry and hasn't thought about what Fauxlivia did to him. She says they can get past it.
Peter gets a text and tells her he has to go for more tests at MD.
Astrid calls Olivia to report the blood. It's A positive, which is Walter's blood type. Astrid does a search and finds Brandon is the only MD person who is as well.
A woman runs down the street, like she's trying to get away from someone. She is panhandled by a homeless man in an alley and she pauses to break his neck. She uses the shifting machine to turn into him.
Nina, Broyles and Olivia storm into Brandon's lab, guns drawn. He's calmly eating lunch and seems totally surprised.
Back in the alley, the shifter now looks like the homeless man. But a hooded figure comes out of the shadows and shoots him. It's Peter.
Brandon sits down for the lie detector, which says he's telling the truth.
Olivia goes back to the lab and wants to go through her files.
Back home, Walter makes himself a banana split. Nina calls wanting to schedule Peter for more tests.
Suspicious, Walter goes upstairs to look through Peter's room. He finds Fauxlivia's files -- with the names of the shape shifters that have been killed so far circled.
Peter watches a man return home.
In the lab, Olivia reads Fauxlivia's comments about Peter, showing she was starting to have feelings for him. She's struck by how much the notes sound like her.
She has an idea to use her childhood nickname Olive as a code, searching the page and line number corresponding to each letter of the alphabet. They all line up to the dead shape shifters. They get the last: Zack Albert.
Cut to Peter breaking into a man's house.
He walks up behind a man as he watches TV and shoots him. It's a mannequin. The real guy knocks him over from behind. "Hello my friend, I was expecting you," he tells Peter.
He puts a gun to Peter's head and asks how he was getting his info. He's threatening to cut out Peter's eye to make him talk when Walter randomly walks in. Peter takes advantage of the distraction to throw the shifter off him, whack his fingers off with a cleaver and shoot him.
Olivia races to the fifth shifter's place, calling Broyles.
Walter watches Peter as he digs the drive out of the shifter's back. "I'm tired of being reactive," Peter says. Peter insists that he's not doing anything wrong because they're not human. He finishes the shifter off with a shot to the head.
Walter asks why he didn't tell them. "This is not you," Walter says.
Peter's phone rings. It's Olivia, on her way to the apartment where Peter is currently standing over a shifter's body.
A few moments later, Olivia walks inside and the Bishops are gone.
Later at the Bishops' house, Olivia complains to Walter and Peter that they failed and are always a step behind.
As she's leaving, Olivia tells Peter she read the file and he has nothing to be embarrassed about. When she leaves, Walter says he thinks he knows what's happening to Peter, saying that all relationships are reciprocal. "When you touched the machine it changed you, weaponized you," he says.
"So what do we do now, Walter?" Peter says. "I don't know," Walter says.
Back at MD, Brandon tells Nina they found three copies of the First Peoples book. They're in three different languages but are all the same.
They learned someone else was looking for the book a few years ago: William Bell.
Back home, Peter contemplates his new weaponized self. The machine waits in the hangar for him.
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