- The Observer returns, taking an active role in righting an old wrong (which includes - mundane for him - thwarting a bank robbery).
- In a retirement home, the former keyboard player Roscoe Joyce of the band "Violet Sedan Chair" is a sleepwalker. One night, he meets a young man in the corridor and he claims that he was his beloved son Bobby that died twenty-five years ago. However he does not recall what Bobby told him. The Fringe Division investigates the case and they find footage in the surveillance cameras showing Bobby and The Observer in the spot. Walter, who worships Roscoe, brings him to his laboratory to hypnotize him to know what Bobby told. Meanwhile The Observer meets Walter and tells that when he brought Peter from the parallel universe, he unleashed a series of events in a chain reaction and now he is fixing the timeline. Walter fears that Peter's life is in danger and tries to find what he can do to save his beloved son.—Claudio Carvalho, Rio de Janeiro, Brazil
- An Observer makes contact with the Fringe Team to help rectify a mistake. Meanwhile, Walter befriends Roscoe Joyce, keyboardist for Walter's favorite 1970s band, "Violet Sedan Chair." Walter will learn the real reason the band broke up and realize that the lives of these two men, who have never met before, overlap in strange and unexpected ways.—Fox Publicity
- Walter mixes up a green potion at home and drops his pants to inject. Peter comes upon this scene and Walter explains he's trying to make himself smarter, so he can be Walternate's equal.
Peter reminds him William Bell took out those parts of his brain because Walter asked him to, because he was afraid of what he was becoming.
Boston, Mass.
In a senior care facility, orderlies notice a patient named Joyce roaming the halls and then talking to someone. There's a window open in his room. They think he was sleep walking, but he says he was talking to Bobby -- his son who died in 1985.
Outside, we see the guy from the picture meeting with The Observer, who says next, he'll take him back home.
A man delivers something to Olivia at home. It's a book called "If You Meet Buddha on the Road, Kill Him!"
Inside is a note from Peter that says: "Because you asked."
She's called to Parklane Senior Care.
Broyles shows them a photo of a man talking to Mr. Joyce in the hall, and a another of the same man outside -- with the Observer.
Mr. Joyce doesn't remember what they were talking about -- he was sleep walking.
Walter sees Joyce and freaks out. He's Roscoe Joyce, the keyboardist of Walter's favorite band, Violet Sedan Chair. Joyce says it's a curse not remembering a miracle.
Walter thinks The Observer transported Bobby through time. They don't know why, but Walter says every time the Observer shows up it has to do with Peter and it's bad. Walter wants to take Joyce to the lab to help him remember.
Olivia gives the book back to Peter -- based on the date of the order, it was for Fauxlivia. He tries to apologize.
The Observer interrupts a robbery in a jewelry store, going all kung fu Observer and stopping bullets with his hands.
He finds a woman tied up in back. She's having trouble breathing. He administers her inhaler and takes it with him.
Peter brings a piano into the lab. Walter hypnotizes Roscoe.
Peter shows Olivia the book -- his favorite. He says it wasn't meant for Fauxlivia, it was meant for the Olivia he's spent the last couple years of his life with.
Olivia says it's just a reminder of everything she missed out on.
Back out in the lab, Walter sits Roscoe at the piano, still hypnotized. He starts playing and Walter asks him about the night he saw Bobby.
Roscoe says he didn't believe it was him and he's about to say what Bobby said when Olivia's cell phone rings and takes Roscoe out of it.
The Observer was spotted in Brookline. She leaves.
Then Roscoe remembers Bobby was in a brown shirt and told him he'd meet Walter Bishop and was supposed to help him. But he doesn't know how.
Cambridge, Mass
The original Observer meets with an older Observer on a street corner. Original says "it is in motion." Older says he doesn't think Walter will do it, but Original disagrees, and says Walter has changed.
Original calmly steals a truck and drives off.
Back in the lab, Roscoe plays and they try to figure out how he's supposed to help Walter. He says Violet Sedan Chair broke up over creative differences.
Peter and Olivia meet with the woman who The Observer helped. She says he saved her life.
In the lab, Walter tells Roscoe about brain mapping and a serum he developed for it -- mixed with milk. He puts it, unlabeled, in the fridge.
Roscoe mentions his favorite drink is a strawberry milkshake. Walter sends Astrid to the store for ingredients.
She leaves and The Observer comes in, saying he and Walter need to talk.
They go for a walk. Walter begs The Observer not to take Peter. The Observer says he doesn't know how to stop Peter from becoming part of the machine on the other side.
He says after he saved Peter, later that summer Peter caught a firefly and a so a girl three miles away did not. When she didn't come home, her dad went out looking for her and, driving in the rain, didn't see the stop sign, slammed the brakes and skidded through the crosswalk and hit a pedestrian.
"You and I have interfered with the natural course of events," he tells Walter. "We have upset the balance in ways I could not have predicted."
He tells Walter he needs his help. "When the time comes, give him the keys and save the girl," he says, cryptically.
Peter calls and The Observer disappears. He mentions "the girl" the Observer saved, Victoria De Miro. Walter wants her brought to the lab.
Back in the lab, Roscoe helps himself to strawberry ice cream. When Walter returns, he tells him Bobby called him years ago to tell him about a dream he had in which a bald man in a dark suit took him to see his dad.
Walter tells him he thinks it really happened. That was the last conversation they had. Bobby was on his way to their show in the Harvard Yard that night, in the rain, when he was hit in the crosswalk when a truck skidded through a stop sign.
Roscoe says he broke up the band after that.
Walter goes and tells Astrid he knows what The Observer is doing. He tells her about upsetting the balance in two universes. "That man lost his son, because I was unwilling to lose mine," Walter says.
Walter says he can't help the Observer because it would mean losing Peter all over again. He calls Peter, minutes away from the lab with Olivia. He wants Peter to ask the girl where she was in 1985.
Peter is explaining she's in the car in front of them when all of a sudden a truck runs through the intersection and slams into the car she's in.
At the crash site, The Observer gets out of the truck and runs off. Olivia chases after The Observer as Peter goes to help the woman. She's having another asthma attack, but manages to tell Peter the Observer took her inhaler.
Walter pulls up. Peter explains what's happening, then wants to go after the Observer. "Give me the keys and save the girl," Peter says.
Walter freezes and tells him the Observer predicted he'd say that. Walter tells him he's afraid if he lets Peter go, he'll die.
Peter says he can't predict the future and asks for the keys again. Walter hands them over.
The Observer runs down an alley and loses Olivia.
Peter drives up and see him heading into a building. He crosses traffic, barely avoiding getting hit three times.
Back with the woman having an attack, Walter uses a plastic drink bottle to push air into the woman's lungs.
Peter finds The Observer on a rooftop and asks him what it's all about. Peter asks him about the picture of him and the device.
The Observer says it must be very difficult, being a father. Then he takes out a gun and shoots Peter with a blast of something. Olivia runs up and starts to chase him, but he gets away.
Peter wakes up.
Olivia calls Walter and says Peter's OK.
Walter says it doesn't make sense and wonders why The Observer would do all this.
Astrid and Walter bring Roscoe back to the center. He tells Walter to visit some time, and bring a strawberry milkshake.
Roscoe says he'd forgotten what it felt like to be around his son, but he remembers now. He's grateful for the second chance.
Back at the lab. "First he saves the girl, then he tries to kill her. Then he runs up five flights of stairs just to shoot me with his magic air gun and disappear. None of it makes any sense," Peter says.
"And how is this different to any other day?" Olivia responds.
Peter goes for a drink in the fridge to wash down his aspirin. He grabs Walter's brain mapping milk.
Olivia sees the book he bought and asks why it's his favorite book. He says because it talks about not depending on other people for answers.
Peter pops aspirin and takes a drink of the milk. Then he collapses.
Olivia calls Walter and tells him Peter's having a seizure. He tells her to grab things and inject him, but he can't remember where it is, so it takes forever.
She injects him and he stops seizing. Olivia tells Walter, he's OK.
Back home, Walter makes Peter chicken noodle soup. Walter tells Peter his serum was flawed and it would have killed him if he'd taken it. Peter only lived because he's young and healthy. He thinks the Observer gave Peter a bump on the head so he'd take aspirin and wash it down with milk.
Walter thinks The Observer saved his life.
Outside the house, the Original and Old Observer watch. Original confesses he thought his "experiment" would fail. "But he's changed," Old says, "he was willing to let his son die."
"Yes, and now we know when the time comes, he will be willing to do it again," The Observer says.
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