Lincoln comes in to the lab to see the cow in an FBI jacket. Walter thinks she has Seasonal Affective Disorder, so they're taking her to her favorite field. It's a group trip with Walter, Peter and Olivia and Lincoln feels left out.
Olivia gives Lincoln a small talisman with his dead partner's name, Robert Danzing, engraved on it. She barely remembers he was Lincoln's partner. He reminds her he gave it to her as a thank you for saving his life. It's Native American, with a maze and a person on it, with home in the center. He gave it to Lincoln because he moved around a lot. Danzing gave it to him to remind him he always had a home, he called it his tether.
Astrid arrives with files. The Other Side wants a detailed debrief of their run-ins with Robert David Jones and she is going because of the holes in Olivia's memory.
Lincoln goes to Broyles, telling him he could use the time away.
The Other Side
A woman walks to her car on top of a parking garage late at night. A man grabs her before she can get to her car. He knocks her down and takes out a knife. Then they both see a disfigured person standing behind him, with a bloated face and stringy hair. He takes on the attacker.
Lincoln takes the files to the bridge and crosses over.
Bolivia joins him. He vaguely tells her what's going on with his Olivia.
In the car, he watches a news conference of Walternate talking about opening up closed off zones of the city. The opening of the bridge is leading to fewer rifts on their side.
She asks him to settle a bet and asks his middle name: Tyrone.
At the scene, Bolivia rubs it in Captain Lee's face. They've been partners six years and he wouldn't tell her.
Captain Lee briefs them, there have been a string of vigilante crimes. The assailant's face is melted. It's the first assailant/victim they've found.
A man who looks just like the attacker packs things into a van. Nearnby, a Fringe team does a sweep and pronounces the area clear. They get a reading of a high level of tissue organics.
The man hides in his van.
The team follows the reading and finds recent footsteps into a church basement, even though the zone's been uninhabitable for eight years.
They find piles of melted bodies.
Bolivia and the Lees report to the church. Agent Lee asks to stick around on the Other Side to help, a random FBI agent asks to shake his hand. Bolivia explains that on this side, his Fringe team are heroes for helping heal their world.
The man, Canaan, goes to a soup kitchen for some food. One of the other homeless men tells him he has something on his neck. It's a bubbling patch that is oozing and looks like a bad burn. Canaan runs out.
In the church basement, they count 18 bodies, 19 heads.
Olivia notices a bed, someone was living there. That would explain why he left his last victim behind, because he knew the zone was being opened and his lair would be discovered.
Lincoln notices a necklace and lifts it off the oozing body. It's a locket with a blonde woman's picture in it. As he lift the locket the head falls off and he sees holes in the roof of its mouth. He asks if they can calculate time of death.
Back at Fringe, Capt. Lee gets Agent Lee the info. Agent Lee asks Astrid to look for surveillance footage. He's not ready to talk about his theory yet.
Capt. Lee asks Agent Lee why he doesn't want to go back home. They decide they're not very alike. They compare histories to see where they diverged: they grew up in the same town, went to the same high school, had the same prom date.
Astrid gets a facial recognition hit on the woman in the locket. Her face has bubbly pink growth on it and the footage is from two days after she died.
Agent Lee tells Broyles he thinks the vigilante is a shape shifter.
He explains he's studied up on shape-shifters since his partner was killed by one. The earlier versions used a three-pronged device in their palette that left holes just like the victim in the church had. He can't explain why the other victims don't have the same wounds.
Broyles shuts him down hard and orders him to go home.
Canaan watches a young boy play soccer in a park, with tears in his eyes.
Two junkies get stoned out of their minds. One goes to the bathroom and the other is attacked by Cannan, who pulls a tube like an umbilical cord out of his mouth and jams it into the junkie's palette. The other one hides and watches in horror.
Astrid relays the report to Broyles. They lock down the area.
Agent Lee suggests they circulate the victim's mug shot, in case they are dealing with a shape shifter.
On the way there, Bolivia gets a report from Astrid that they've spotted the shifter. Teams converge on the area and satellites show he's heading toward Agent Lee. Over the comms, Captain Lee tells him he's a good agent, but Agent Lee wonders where their paths diverged.
Agent Lee sees the suspect and starts chasing him, he follows him into a building. He's looking for him in the warehouse when all of a sudden he gets tackled from behind.
Agent Lee's gun gets knocked out and the shifter gets it. Agent Lee is on the ground, defenseless, and the shifter aims at him, but takes pity and doesn't fire.
He runs and is quickly surrounded by Bolivia, Captain Lee and their teams. Agent Lee shouts at them not to shoot.
The shifter surrenders.
Broyles gets the news back at Fringe Division. He makes a call, telling someone they have him in custody and giving the location.
"Thank you Colonel, we'll take it from here," says Nina from the other end of the line.
Agent Lee looks in on the suspect. Bolivia comes to get Lee to move him out, but he asks her for five minutes alone with the shifter to talk to him before he's taken into custody.
A man with a briefcase goes to the top floor of a building. He opens the case and assembles his high powered rifle.
Agent Lee dismisses the agents guarding the shifter, to talk to him alone. He asks the shifter why he didn't kill him when he had the chance.
He sees the picture of the young boy. Lee asks if it's his son, the shifter says it's her boy.
"Jones took you from them when he did this to you?" Lee says.
Jones came later, she left him first and took Daniel with her. "They just went on living their lives as if I was never there," he says.
He says he's not a person who drifts through life effortlessly. "I wanted to be needed or at least to be missed, do you understand?"
Dr. Jones understood and promised to make him something better. He was supposed to be the first of a new breed of humans, but he was a disappointment.
Lee points that David Robert Jones is not worth protecting.
The shifter says Jones promised he'd come for him, to fix him.
Lee walks out.
Outside, Captain Lee escorts the shifter to the transport van. The sniper takes aim, but misses. Olivia grabs her own rifle and takes aim. She hits the sniper.
Then Agent Lee sees that Captain Lee was hit. He's down but manages to ask Bolivia who else knew they were transporting the shifter.
Agent Lee grabs the shifter and tells him the bullet was meant for him, that Jones, the man he is protecting, just tried to have him killed.
"You can keep waiting for someone else to define you, to give you your place in the world. Or you can decide that you're not just somebody's broken puppet anymore. Choose!" Lee tells him.
Fort Lee, New Jersey
Nina surveys a room full of shifters in tanks. The sniper returns from his mission.
"I trust you have good news for me," she says to him.
"I do, we've tied up our loose end," he says. He says the red head nearly took his head off with a nearly impossible shot.
Alarms start to go off signaling a security breach. Nina wheels around and sees the sniper -- not actually the sniper -- at the computer. It's Canaan.
Bolivia and Agent Lee and teams of agents come down the hall. Nina makes it out the side door, but is stopped on the roof by helicopters.
Broyles gets a call that Nina has been captured.
Astrid comes in to report something to Broyles. She's upset.
Back in Nina's lab, Agent Lee finds that there's a tracking system for all of the shape shifters. An agent comes to tell Bolivia bad news. Captain Lee didn't make it.
Agent Lee goes through the bridge with Canaan (in sniper form).
Agent Lee tells Canaan there's a man there who can help him.
"I'm really looking forward to studying- helping you," Walter tells him.
Lee tells Canaan he thinks he'll like it there, he won't have to wait for anyone to give him a home.
Agent Lee gives Canaan his talisman, "to keep you from floating away."
Bolivia goes through her Lincoln Lee's things and finds a picture of the two of them. Agent Lee comes back.
He tells her they have a lot of intel on Jones and he thought he might stick around for awhile, that she might need some help.
They need each other. He, who loves another version of her, and she, who just lost her version of him.
She says that'd be nice.