- The team retrieves another cassette tape from the amber. With Nina Sharp's help, the team recovers 2 cylinders. While Peter works independently to score a minor victory against the Observers, Olivia ascertains Peter's secret.
- As Walter notices unattractive changes in himself from his brain restoration (leading him to make a startling request of Nina Sharp), Olivia notices changes in Peter - now cold and calculating - which leads her to learn of his implant as the team labors toward obtaining the next vital elements needed to defeat the Observers.
- Peter is learning his new abilities following an Observer. Meanwhile Walter retrieves another tape and the group learns that they need to recover two cylinders that belonged to The Observers and act like beacons that are stored in a William Bell's facility. When they arrive at the place, they find that the place was bombed and the access is obstructed. They head to ask Nina for a device that turns solid into gas. Nina is worried with Walter's behavior after implanting the pieces of his brain. Olivia feels the change in Peter and leans that he has implanted the Observer's device. Meanwhile Peter calls Anil and plots an evil and mysterious scheme against a group of Observers. What will happen to Walter and Peter?—Claudio Carvalho, Rio de Janeiro, Brazil
- Peter tries out his fancy new Observer technology. He can see and hear from far away and watches as a carful of Observers picks up Mueller for a meeting.
Peter steps out into traffic in front of a red light, stone-faced like an Observer. Then he walks to the curb and waits. The scene he has witnessed plays out. Mueller walks out of a building and bumps into the same woman. But he is not picked up by the same car of Observers and keeps walking. Peter calls Anil for help.
Peter returns to Walter in the lab with the fuel for the laser. Olivia is concerned that Peter didn't sleep, again, and left in the morning without her.
They're interrupted when they hear loyalist guards pull up outside the lab. They get out and look around, but then get back in the car and leave.
Astrid frees tape five from the amber. Walter shows the viewer drawings for a beacon (the metal egg-shaped thing with grooves in it) that the Observers use to locate points in time. He says they need two and can find them at Kelvin Genetics, a lab Walter and William Bell designed. Walter explains William was keeping two in his storage facility and they need his handprint to unlock it.
That's why William was in the amber with them and why Walter took his hand when they were freed. But, Astrid says, that's not the only reason. Before the invasion, William came to Walter and said he wanted to help, but then he betrayed them to the Observers. Walter remembers that and also being tortured by a man with an accent who kept asking if something was safe. But Astrid points out he's remembering "Marathon Man."
Instead, Peter remembers Walter called him in Boston to implement the plan. He sent Olivia to Grand Central to collect the thought unifier. But the time Peter reached Walter and Astrid they were with William Bell, but the Observers found them and they realized they William was the only one who could have told the Observers where to find them. That's when Walter ambered everyone.
They don't have a way of knowing if William was telling the truth about having the cylinders, but they want to find out.
They go to the burned out shell of the warehouse. Using Observer Vision, Peter can see the door when no one else can. Olivia notices Peter is bleeding from his ear.
Walter examines his ear, but Peter says he's fine. They try to figure out how to get through the rubble which is blocking the entrance.
Anil calls Peter, saying the plan didn't work. Peter expected an Observer to forget his briefcase in a park, but he never did so Anil couldn't make the switch for the one Peter gave him. Peter is incredulous and says he's on his way.
Walter wants to reach out to Nina Sharp with the Minister of Science for help getting through the rubble. Peter tells Olivia he's going to go meet with Anil, but says Anil wouldn't say what it was about. Olivia worries about him.
Nina Sharp gets a message and goes to meet Olivia, Astrid and Walter. She heard about Etta, who she was close to, through Broyles, and offers condolences.
They explain the rubble they need to move. She suggests Observer tech for sublimation, converting solid matter into gas. The rubble would essentially evaporate.
Later, she meets up with Walter and tells him she told Etta and Simon how to reimplant the portion of his brain he had removed. He tells her Peter is going to help him make sure he doesn't turn into the man he used to be. Nina tells a lab tech named Hastings to give Walter anything he wants.
In the park, Anil recounts everyone who was near Royce the Observer. Peter says there was supposed to be a little girl with a ball who distracted him, but Anil says Royce was talking on his comm and didn't see her. Peter realizes the comm was the variable he didn't account for. He mentally reviews Royce's path, including checking his briefcase at a restaurant. He takes the briefcase to make the switch himself.
He gives Anil the address of an Observer precinct, saying at 6:17 Royce and Mueller will walk into the building. He tells Anil to call him when they do. Peter is sounding more and more like an Observer, cold and calculating.
He gets in a car to hotwire it and gets a splitting head ache and sees a blinding light. He shakes for a moment, but the feeling passes.
Peter goes to the restaurant and checks his briefcase. He takes a seat at the bar and waits.
Waiting for Walter, Astrid asks Olivia about Peter. He doesn't sleep and leaves the lab at odd hours. Olivia thinks there's something he's not telling her. She's worried she's losing him again.
At the bar, Peter watches Royce check his briefcase and sit down for lunch. He checks his watch and then approaches the coat check as the hostess is getting an annoying phone call from her boyfriend. As she's distracted, he points to Royce's briefcase as if it's his and walks out with it.
Back with Walter, Hastings explains the tech he's lending them.
Nina tells Walter she's worried about him. She tried to hold on to William but lost him to the pull of unlimited power. Walter coldly tells her William never loved her because he never loved anyone but himself. For a moment, he reminds her of old Walter.
Walter again insists that Peter will be enough to save him.
Nina wishes them luck and warns them the Observers monitor changes in the atmosphere so they'll be on them shortly after they use the sublimation device.
At 6:17 p.m., Anil watches as Mueller and Royce arrive and enter the building.
They go into a conference room and Royce opens his briefcase. Anil looks up to see the explosion. Their faces essentially fall off in pieces.
Back at the collapsed building, Olivia and Astrid set up the device. Peter drives up and takes a call from Anil saying it worked.
Peter tells Olivia that he waited for Anil for an hour, but he never showed.
Walter activates the device and they watch as the pieces of rubble crumble and disappear. They go inside and downstairs to the storage facility. They power the electronic lock back up and scan William's severed hand. The door opens.
There are specimen jars and experiments everywhere and, to Walter's horror, his old David Bowie record. Peter finds a wall safe. Walter says he knows the combination but then struggles to remember it.
As Astrid and Olivia get antsy, Peter lays a soothing hand on Walter's shoulder and tells him to take all the time he needs. He tries again with five-twenty-ten and it opens.
The safe is empty except for a small device the size of a hockey puck. There are also some files and an old photo of Nina. Walter takes the photo.
Peter activates the small device and it glows red and the floor starts rumbling. The beacons drive up through the floor.
On the way out, Olivia warns Peter to wait because they don't know what's out there. But he keeps walking, never stopping. He says he'll take his car because it's "logical."
Olivia can tell something is seriously off with him.
Walter asks to make a stop on the way home. He goes to see Nina and tells her everything worked. He gives her the photo of her that was in William's safe. "I was wrong, he did love you. And it wasn't enough," he says.
"I'm scared, Nina. Every day that goes by I feel 'him' more and more," he says. He asks her to take the pieces of his brain out again.
Olivia arrives home to sees Peter's surveillance work, timelines of the Observers' activities. He explains Royce and Meuller were Windmark's top lieutenants.
"The tech that gave them their advantage over us. I have it now," he says. "That thing in their heads? You implanted one in yourself?"
Peter nods, and says he's been following them. He says he's been following them to predict their futures and was able to alter their paths just enough to get them in the same place at the same time. He used the flesh eating toxin from flight 672 from Walter's cold storage. "Our first Fringe experience was their last," he says.
"That's why you knew they wouldn't be coming for us at the storage site. You know they would still be responding to your attack," she says.
He says her next few sentences as she does. "You can't do this. This is dangerous."
"We're going to avenge Etta. Windmark's next," he says.
Olivia is totally and completely freaked out as Peter is in full Observer calculation mode.
Back at the lab, Walter looks over the pieces of his plan they've collected. The rock, the thought unifier, the radio from the pocket universe, the beacons. The turns the radio on and puts on his David Bowie. He listens to "The Man Who Sold the World."
Peter continues cataloging his observations of the Observers, including Windmark taking the elevator. He ignores the pain in his head, but rubs it and comes away with a handful of hair.
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