- The Fringe team attempts to find out what process enables people to become lighter than air and float. Peter and Olivia deal with trust issues in their relationship, while Walter becomes increasingly obsessed with retrieving William Bell's consciousness from beyond the grave.—Nightice
- When a thief is shot by a security guard and floats, the Fringe Division is assigned to investigate. They find that the scientist Dr. Krick is the responsible for the experiment trying to cure his teenage son. Meanwhile Walter seeks out Nina Sharp and retrieves William Bell's research of the soul magnet with the intent of bringing his friend from the beyond and chimes the bell Nina received from William. Peter decides to keep no secrets from Olivia and brings her to his laboratory. However he has a huge surprise.—Claudio Carvalho, Rio de Janeiro, Brazil
- Walter lords over his Massive Dynamic kingdom in the security booth, doing bong hits with the watchman -- HURLEY! Sorry, "Kevin" (Jorge Garcia).
They watch the security monitors, tripped out. Walter notices a room no one goes into. William Bell's office.
Cut to Walter bringing William's old research files to Nina.
He mentions that Peter and Olivia are a couple now. Walter is freaked out by his failure to save the universe on his own. He wishes he still had William.
Massachusetts Metal Depository Two figures in black scale the outside of the building. At the top, they strap on boots and somehow walk upside-down on the ceiling. A security guard intercepts them. And then the camera turns upside down and we see that the guard was on the ground and the people were climbing DOWN and strapped on boots to keep them on the ground. The security guard shoots one of the men. His blood floats up into the air and his body floats away.
Harvard Engineering Building Peter runs trials on the shape shifters' memory cartridges. He's linked them and found a bunch of data, but has no idea how to read it. Olivia calls. He contemplates before answering. He lies and tells her he's at the gym.
Broyles texts Olivia to the floating guy crime scene.
Once there, Walter marvels at the guy's floating body, hovering like a helium balloon. The other one got away. The guard provides a sketch of him. He says no precious metals were taken.
They found a key card on the dead guy, but not to the metal building.
They check out his body and find his legs are atrophied but his chest and shoulders aren't. Olivia reports that Osmium was stolen. It's used in electrical contacts and fountain pen nibs. Peter says it's rare but not valuable. Walter says it's the heaviest element on earth.
Dr. Crick (Alan Ruck) leaves his office and finds the other thief waiting for him in the parking lot. He tells Crick the other guy is dead. He says he's nauseous and has a terrible headache. Crick tells him to meet him at the lab. The man is wearing weighted shoes to hold him down.
Peter looks through William's notes for research on gravity. Walter finds no helium or anything gaseous in the thief's blood. His white blood cell count is low. He's floating less.
Olivia and Peter head to the warehouse the keycard was traced to.
Meanwhile, Click uses his keycard to enter a warehouse. The man is waiting for him. He's bleeding from his eyes.
The doctor explains his participation in the experiment will help him find a way to eliminate the side effects. The man dies.
Back at the lab, the floating man crashes to the ground. Walter and Astrid try to move him but his body weighs a ton. Walter wants to test for osmium. But he doesn't see how it would make the man float.
On the drive to the warehouse, Olivia is completely honest with Peter and says she hates his back rubs. She says trust is great when it goes both ways. Peter doesn't mention his secret research.
At the warehouse, Crick amputates the other dead floating man's foot. He takes bone scrapings. He sees Peter and Olivia coming on security cameras.
They get inside and find not just the thief, but another body cut up and even more in the freezer. They all had high levels of osmium in their blood. They were injected. Walter's still stumped over how it worked.
Broyles finds piles of wheelchairs out back. The men had Muscular Dystrophy and had been confined to wheelchairs for years.
Crick watches a game of wheelchair murderball. His son is one of the players. He strikes up a conversation with a young man in a chair in the stands. He says he can give him a miracle.
In the lab, Walter examines the osmium from the dead men's blood. Peter and Olivia look over the victim's files. Peter suggests a pizza run. They're holding hands in the hall when they run into Nina. She has a file for Peter. He casually mentions he's doing research on shape shifters.
Astrid brings Walter mints. He's stumped over how someone defied physics by making the heaviest element lighter than air. He drops a mint in a 2 liter of soda and it sprays everywhere. Nina comes in and Walter whimpers about needing William's help.
He found research on "soul magnets" in William's stuff -- his theory that people live on, their consciousness just needs a vessel. He suggested implanting magnets in someone to tie them to the vessel before they die. Walter wonders if William did it and they just have to find the vessel.
He's despondent. Nina assures him he won't fail. "Because you can't," she says.
In a basement, the doctor injects the young man Vince with something. Almost immediately, the man rises to his feet. He takes a few steps then floats off the ground. The doctor hands him weighted shoes and tells him to wear them outside. Then he says he doesn't have enough material for another treatment. Vince asks how they get more.
In the lab, Walter tries melting the osmium from the blood with liquid nitrogen. He finds it reacts oddly and concludes it was mixed with another element.
The doctor puts his son Michael into bed and says he has to get back to work at his office. He says he has a new project that's keeping him busy. He tells his son he's close to something big -- a breakthrough that'll change everything.
Walter tells Peter about the osmium being mixed with another element found in meteorites. The Museum of Science has meteorites.
Cut to Vince dressed all in black about to break into the Museum of Science. He floats down to the meteorite.
Olivia, Broyles and Peter show up outside. They see the weighted shoes and a rope outside.
Vince lets Crick in from outside. He scans some meteorite samples, but they notice everyone coming.
Crick runs. Vince is left floating helplessly. He cuts his tether and floats up into the high ceiling. He grabs onto a suspended astronaut display but starts to slip. Olivia catches up with Crick.
Peter leaps onto Vince before he can float away and they gently come to the ground.
Peter brings Crick's son into visit him in lock-up. He tells his son he hurt some people while he was trying to help them. He says he was going to fix them. He says he did it for his son. His son asks if his dad thinks he needs to be fixed. He says he was happy.
Walter asks Crick how he defied the laws of physics. Crick says he works in aeronautics and was hired to create a new alloy for military aircraft, dense enough to keep pilots safe from ground fire but still allow for flight. He combined two elements and, somehow the result was lighter than air. He says it was an accident.
Walter visits Nina. He says Crick is in custody but he's not responsible. Walter is. He says Crick didn't change the laws of physics, it was already happening because of what Walter did 25 years ago. He thinks he's figured out how to stop it.
Peter asks Olivia to meet him at the engineering building. He tells her that because he's at the center of whatever is happening with the two universes, he's been working on something, but hasn't told anyone. He doesn't want there to be any more secrets between the two of them.
Walter brings up soul magnets again to Nina. They notice the brass bell that William left to Nina. He thinks the harmonic vibrations from the bell will bring the energy from William's soul. He rings it. Nothing happens. Walter says he thinks William will find them.
Peter shows Olivia his research on the machine. When she sees the shape shifter memory drives she realizes he must have been the one killing to get them.
He starts to explain more what he's doing when suddenly Olivia spaces out. Then she tells Peter the decoder for the memory drives is in her office -- the one at Massive Dynamic.
"Hello, Peter, it's nice to see you again," she says.
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