- A mysterious Fringe event, causing people to spontaneously combust, forces Walter to revisit his painful past while the Fringe team faces off against David Robert Jones to save the world - or worlds.
- When more than two dozen people die from spontaneous combustion, the footage shows the responsible, David Robert Jones. However Walter investigate the technology using nanites and he believes that William Bell is behind the event since Jones would not be capable to develop such technology. While Olivia and Peter hunt Jones, Walter wants to prove that William Bell is alive and brings Olivia with him to a warehouse where Bell used to import almond.—Claudio Carvalho, Rio de Janeiro, Brazil
- Boston, Mass., Clane Center
A man orders his usual coffee as people come and go. He rides the escalator, touching the rail like most people do. He walks outside and starts to feel not right. He drops to his knees, gripping his stomach, then he falls over, cold breath coming out of his mouth. A woman stops as she watches people around her turn pink, with black mouths, crumpling to the ground. She warns the people around her not to move.
"I think when they move, they die. Nobody move," she says.
Peter reads through house listings in the paper. Olivia suggests a place with a nursery. They agree. They both get calls.
At the scene, beyond the crime scene tape, Walter shouts at the crime scene tech to examine the woman who's still smoking. There are still people standing still among the smoking corpses.
More than two dozen people experienced simultaneous spontaneous combustion.
Inside, Walter examines a victim. A woman near him (Rebecca Mader) holds still and asks him if she's going to die. He asks to take her blood sample. He notices black smudging on her fingertips and she guesses it came from the escalator.
Astrid examines it and finds signs of something.
They find a device in the escalator. Walter looks at it and announces they're not dealing with a virus, they're nanites. People's movements activate them. Walter wants to take someone back to his lab, even if moving them is dangerous. Jessica (Mader) volunteers.
Back in the lab, Jessica tries to lay still. She calls her ex-husband and asks him to pick up their daughter from school.
Astrid reports that Jessica's temperature is rising rapidly. Walter races to finish the antidote as Jessica starts to overheat and hyperventilate.
Olivia holds her hand and uses her powers to calm her down, draining all the energy from the lab. Jessica stabilizes. Olivia has no idea how she did what she did.
Later, Peter gives Jessica the antidote. Olivia asks Walter for answers. He thinks the Cortexiphan gave her the power to slow down molecules, causing Jessica to cool down. But he has no idea how she did it.
Olivia walks Jessica to a patrol car for a ride home. Broyles calls.
Back in the lab, they examine footage of someone placing the nanites: It's David Robert Jones.
Walter examines the nanites and is shocked at what he sees. The design is familiar.
David Robert Jones strolls down the hallways of his ship. He reports to someone that Agent Dunham has stopped them again. William Bell (Leonard Nimoy) laughs. "Don't be so sure," he says.
Bell gives Jones a lesson on chess, saying sometimes you have to sacrifice your most valuable piece.
Walter tells Nina that he's sure the nanites were designed by William Bell. He'd recognize his work anywhere. Nina says William died in a car accident on Christmas Eve seven years ago. Walter thought it was on New Year's because Bell came to visit him the night before, but he can't remember what he said because they gave him additional shocks that day.
Nina tells him Bell had lymphoma and the car crash wasn't an accident.
William summons them to St. Clare's, where he was locked up all those years. They meet with the new administrator to review the visitor logs when Walter was there. There's no record of William Bell in the visitor logs.
Walter starts to sniff the log and then asks to borrow it.
Back home, Olivia slices her finger making dinner. She's worried about her power that she doesn't understand. Suddenly, they notice a bright light outside their apartment.
Broyles walks to his car on the roof of the FBI building and sees people transfixed by a beam of light. It coalesces and blasts through a skyscraper.
Olivia and Peter race to the scene. The light beam shines in the night sky. Walter says Jones is refocusing the sun's power. Astrid gets the geological results. There's an oil field under Beacon Hill, the sun beam could incinerate the whole city. Astrid finds two non-government radio frequencies.
Walter calls Peter and Olivia and tells them where to drive. He thinks Jones has commandeered two satellites to focus the sun beam.
Walter takes lemon cake out of the oven, insisting to Astrid that it relates to William Bell.
Olivia and Peter arrive at their destination and see satellites on the roof. They head into two different warehouses as Jones watches from his car.
Walter takes his lemon cake out of his easy bake -- it had pig brain in it to activate the little known side-effect of Cortexiphan, a partial regeneration of biological matter. He takes out a page from the log book that he baked inside. Finger prints appear. Walter licks the page and tastes Chilean almonds, the kind William was obsessed with.
Walter puts on his coat and plans to head to an import house. Then he realizes he doesn't drive. Astrid goes with him.
On the roofs of different warehouses, Peter walks Olivia through disabling the satellites. They power them down and the beam disappears.
Peter turns around just in time to see Jones standing behind him. He knocks Peter down. Jones tries to wail on Peter with a crowbar.
On the opposite roof, Olivia tries to take aim at Jones. Two security guards run up and aim at her. She tells them she's FBI but they don't draw down.
She tosses her gun, concentrating, and they toss theirs. She realizes she's in control and looks across at Peter grappling with Jones. She pantomimes his movements, helping Peter pop his dislocated shoulder back in, then shoving Jones into the satellite tower.
On the ground, Jones says he got it wrong; he was the sacrificial chess piece. He turns to ash and half blows away.
Walter and Astrid arrive at A1 Imports. A man greets them, and says A1 went out of business three years ago. He's the man who was keeping the hybrid animals on the ship at sea. Astrid notices the man is wearing a gun and lets him leave when he gets a radio call.
Walter and Astrid hear an animal growl and go into the other room. Its stacked with shipping containers making weird animals noises.
Two men stop Astrid and Walter. They point guns at them. Astrid says it's a misunderstanding, then knocks the gun out of one man's hand. She runs with Walter between the shipping containers. But one of the men gets a clean shot and shoots Astrid in the back.
Walter cradles her in his arms and a familiar face walks up.
"Hello, old friend," says William Bell.
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