Castiel helps Sam and Dean hunt down Cupid (guest star Lex Medlin) on Valentine’s Day after townspeople start to kill each other for love. However, after Cupid tells them he’s innocent, they discover Famine (guest star James Otis), one of the Four Horsemen of the Apocalypse, has arrived in town.

The angels send Anna back in time to kill John and Mary Winchester before they can conceive Sam knowing that if Sam was never born then Lucifer won’t be able to use him as his vessel. Castiel sends Sam and Dean back to 1978 so they can stop Anna, and the two brothers are reunited with their parents. Mary recognizes Dean as a hunter since he visited her in the past once before but tries to keep the truth from John.

Gary, a teenage nerd, conjures up a body-switching spell and changes bodies with Sam. Thrilled by his new handsome and built body, Gary (now Sam) investigates a case with Dean and takes advantage of his good looks and age by hitting on women and getting drunk. Meanwhile, Sam is stuck in Gary’s teenage body, dealing with intrusive parents and high school.

A former hunter named Martin, who is currently institutionalized, calls Sam and Dean for help investigating a case in the mental hospital. The brothers get themselves admitted as patients to check out the mysterious monster that is attacking the patients, but their incarceration pushes both to the breaking point as they unleash their inner demons against each other.

Manhattan

Late at night in an architect’s office, a man and woman ride through a “microquake,” the sixth in the last few days. The woman leaves and the office starts shaking again. This time, it doesn’t stop. Lights and pieces of the ceiling come crashing down and the man falls to the floor. When the dust clears the man looks himself over and finds that not only is he skewered on a piece of the building but he has four arms and legs.

Olivia calls the Bishops in and off they go.

The Fringies plus Broyles head to the building. The outside of the building looks rearranged. They’re told there are no survivors. Inside they find bodies melded together.

Walter thinks it was a “quantum tectonic event,” atoms separating and re-assembling all wrong. They get calls that there’s a survivor. It’s the man, Ted Pratchett. He’s freaked out and wants them to call his wife.

Olivia asks what happened and he describes tremors.

He says that yesterday dogs started howling.

Walter sees the plans he was working on were for a new Pentagon annex. Broyles reports that Pratchett doesn’t have a wife, never did. They assume he’s delirious.

Walter asks him a few basic questions, then he asks him what buildings were hit on Sept. 11. He says the Pentagon and the White House. Then he dies. Well, er, almost. They open his shirt and find another head inside his chest and then THAT head dies.

Walter knows his quantum theory was wrong. They’re in two buildings, one of which comes from the alternate universe.

Olivia recognizes it as what William Bell warned her Newton was trying to do.

Back at the lab, Astrid is totally skeeved out by the body-in-a-body of Pratchett. Instead she goes through his things. She finds Richard Nixon on a silver dollar and a toy double decker car.

Walter realizes he knows what Newton did. Worse, he’s just remembered what’s going to happen next.

Olivia finds surveillance photos of Newton and his guys outside the building two hours earlier disguised as a construction crew. Walter calls Peter and demands he and Olivia return to the lab.

He shows them a news clipping of a prank from 30 years ago: supposedly MIT students skewered an intact car on a statue. But Olivia guesses it was really Bishop and Bell experimenting.

Their first test subject was a car. They made one disappear and 12 minutes later, one from the other world appeared. He predicts a building from here will be transported over there within 35 hours. They can’t stop it, but maybe they can evacuate it.

He says things jumping worlds take on a glimmer before they go. It’s not visible to the naked eye, but gifted Olivia might be able to see it - she’s done it before.

Walter tells her about her seeing the glimmer as a child and thinks he can teach her how to do it again - but they have to go to Jacksonville, where they succeeded before with trials of Cortexaphan.

Olivia runs it by Broyles. He’s on board. She asks him to look into micro-quakes and he says he’ll call Nina at Massive Dynamic.

Jacksonville The old lab/day care is in tact, boarded up and abandoned. Walter remembers the combination, but not its significance. It’s 5-20-10, which just happens to be the date the season finale will air.

Walter takes Olivia through the classrooms. In one he tells her 16 items in the room are from the other side. She looks around but notices nothing.

Walter says it’s time to start and wanders off muttering that he was hoping to avoid this.

He goes to a room with lots of covered up exam tables and dentist-like chairs.

Peter finds Olivia outside. She’s bothered that her typically great memory fails her when it comes to this place.

Walter’s ready. He hooks her up and gets the drugs pumping. He warns her she’ll face an emotional obstacle once she’s under their effects.

Walter asks her to open her eyes. She sees a forest and someone else in it. She walks around, through lush green and a light mist, sunlight streaming through leaves. She gets a little amped up and it turns to night in her vision.

She walks toward someone. It’s a young girl who tells her she doesn’t want to do this anymore. Olivia tells her she doesn’t have to do anything she doesn’t want to. The girl runs into the dark and scary woods and Olivia runs after her as wind whips through the trees and dark shadows swoop overhead. She comforts the girl and learns her name is Olive. It’s her.

Suddenly the girl is gone. Then she reappears, with scary cat eyes. Olivia screams and wakes up. She immediately asks Walter what the hell is wrong with him, incredulous that he did this to kids.

Back in the classroom, Olivia looks at the objects around her and sees nothing different.

Walter’s out of ideas.

Back in New York, Nina walks into a building as dogs bark outside. She calls Broyles. He calls Olivia.

She finds Walter in a classroom watching footage of old experiments with her. He tells her the first time they tried the experiment with her she started a fire with her mind. She says they abused her, but he claims he was trying to help her. She reminds him she was a defenseless child.

He realizes the process didn’t work because she’s not that scared little girl anymore. She has to try to become her again.

Olivia wanders into another room, with charred walls. She huddles in the corner, but she has a problem: She’s not afraid of anything anymore.

The Fringies regroup in New York. The Bishops head off with Nina to look at seismic activity.

Walter pooh poohs analyzing data so Peter suggests they look for a building with the same mass as the first.

They’re down to 147 buildings when Walter says it’s time. Broyles doesn’t think there’s anything they can do, evacuations would set off panic.

Olivia finds Peter and is upset that she failed. He reassures her, cradling her face as she cries. He’s about to go in for a kiss when she says she’s scared. He starts to reassure her again, when she realizes it’s an emotional jackpot.

She runs to the patio and looks at the skyline. She sees a building shimmering.

She jumps in her car and drives in the direction of the building as she talks to Broyles on the phone, trying to describe where it is. They narrow it down and call in an evacuation order.

People are running out when Olivia gets there. The force of the building being sucked away knocks her to her feet. She hangs onto a post as is tugged backward as it shakes and is finally sucked into the void, leaving only an empty foundation hole.

Back at the office a news report is calling it a scheduled demolition. Broyles asks what triggered her ability. She says time.

Peter arranges with Astrid to come hang with his dad. He’s heading out for drinks with Olivia. Walter’s excited, but Peter assures him it’s just drinks. Just the same, Olivia primps at her house and lets down her hair.

She arrives at the Bishops and is startled when she sees Peter. He’s shimmering, just like the building from the other world. He goes to get his coat and Walter approaches Olivia. “Please don’t tell him,” he says.

It is Valentine’s Day and while Clark is out on a date with Lois, he unknowingly becomes infected by gemstone kryptonite, which has magical wish-fulfilling properties. Clark mentions to Lois that he wishes they had a more traditional relationship, so Lois quits the Daily Planet, moves in with Clark and starts planning their wedding. Still unaware of his new power, Clark also casually tells Chloe he wishes she would spend more time watching out for him, so an infected Chloe takes his wish to heart and sets her sights on a new target: Lois. Meanwhile, Zod quarrels with Tess as well as his wife, Faora, over the construction of the new solar tower which he hopes will restore his and the Kandorians super powers which will enable them to take over the Earth.

Clark meets the sorceress Zatanna (from episode ‘Hex’) at a comic book convention, where she tells him that her father charmed a copy of the comic book “Warrior Angel” and it holds magical powers. A young boy, named Stephen, steals the comic book and develops super powers, transforming himself into Warrior Angel and saving Chloe from a horrible accident who doesn’t know about Stephen’s true origins. Meanwhile, Lois becomes jealous of Clark’s relationship with Zatanna.

A man named Sylvester Pemberton tracks down Chloe and tells her he knows about her team of superheroes and needs their help. However, before he can explain who he is, he is attacked and killed by Icicle. Clark and Chloe’s investigation leads Clark to the former headquarters of the Justice Society of America, an underground team of superheros, where he meets up with Nelson (AKA: Dr. Fate), Carter Hall (AKA: Hawkman) and Courtney (AKA: Star Girl). Courtney pleads with Hawkman and Dr. Fate to help her catch the killer that is targeting their group but they are reluctant to resume their duties as superheroes. Clark, John Jones, Green Arrow and Chloe team up to help the JSA stop Icicle before he murders another member of the group. Meanwhile, Lois receives a package from a mysterious agency called Checkmate, run by the shadowy Amanda Waller.

Jane flips a coin, announcing it’s the 18th heads in a row. He does it a few more times then Rigsby has to pay up. Jane won’t tell him what the trick is.

In the main room, a beautiful woman is waiting for Cho. Her name is Elise and she’s heard all about them.

They’re about to leave for a dinner reservation when his desk phone rings. A homicide detective is calling just for him. They have the body of an Asian man with tattoos whose phone showed calls to Cho recently. Jane sees how Cho reacts to the news and insists on going with him.

The crime scene is in a dark alley. A detective greets Cho and tells him the victim was shot in the back. His wallet was taken, but she doesn’t think it was a robbery. He also had a piece of paper with lots of numbers on it. Cho doesn’t know what it is.

He looks at the victim, and knows him as David Seung. He got out of Folsom six months ago. He was a member of the Avon Park Playboys, Cho’s old gang. Cho says he hasn’t talked to him in 13 years. He didn’t respond to his messages for help.

As they walk away, Jane asks what the deal is. Cho says they used to be like brothers.

The next day at CBI HQ, Rigsby is still puzzled by the coin flip trick. David’s grandmother comes to see Cho. She asks if he’ll be working to find who killed him. Cho says the Oakland police will be on it. She doesn’t think he was killed because of the gang. She says he was out of it. She asks again for his help, but he says there’s nothing he can do.

Van Pelt and Rigsby offer to cover for him if he wants to take time to look into it. Cho’s not moved, saying that gang bangers get shot. Jane believes the grandmother and suggests they check to see if he was still in the gang.

Jane and Cho head to his old neighborhood. They go into a pawn shop where Cho talks to a fat man who knew Cho as “Iceman.” He says David quit but a month ago he called about a deal , asking to talk to K.S., which the fat man thought was disrespectful. He says he doesn’t know about the deal, but tells Cho that K.S. is still very mad at him.

Jane shows him the paper with numbers on it but the fat man claims not to know what they mean.

Rigsby calls Jane to tell him that David went to work for a janitorial company. Jane suggests they visit the boss. Cho doesn’t see the point, saying David was a banger and deserved to get shot. Jane asks about K.S. He’s a gang leader and a bad guy, Cho says. And Cho shot him once.

Jane and Cho talk to the janitorial boss, Frank, who says he likes giving cons a second chance. A businessman walks by and tells the guy to clean a bathroom. Jane calls him middle management, saying if he were higher up he’d know you catch more flies with honey. The boss says David was a good worker, and he doesn’t recognize the sheet of numbers either.

Back at the office, Lisbon has gotten a call from the detective and wants to know what they’re doing. Cho apologizes. When she leaves, Jane suggests they go visit K.S. Cho walks away.

At his house that night with Elise, Cho is distracted. She asks him about it, but understands when he doesn’t walk to talk about it. They’re starting to kiss on the couch when two masked men bust down the door and throw him to the ground. One tells him to stay out of Playboy’s business. They punch Elise in the face.

He holds her hand to the ambulance. She’s swollen and bruised, but OK. She asks if he’s coming with her, but he says he has some things to take care of.

Lisbon’s there and tells him they’re taking over the case. She’s laying out the plan when Cho walks away mid-sentence and gets in his car. He finds Jane in the passenger seat.

Jane asks why Cho shot K.S. He explains that K.S. wanted to do a home invasion, which meant terrorizing a family, but Cho wouldn’t do it. K.S. pulled a gun on him but he pulled his faster and shot him in the shoulder. He dropped out of the gang and gave the gun to David, who got pulled over with it a few days later and got an increased sentence. But Cho says he didn’t feel responsible because David was stupid to have it on him.

He enlisted two weeks later and never went back.

Back at the pawn shop, Cho goes looking for K.S. Cho tells him he’s not a cop tonight and threatens to break the guy’s arm unless he helps.

Back at the office, Van Pelt has found names of David’s coworkers at Cedar Creek Equities, where Cho and Jane met with the boss. Ven Pelt and Rigsby head there. A secretary says he’s not there but calls him. She’s sniffling, which she attributes to allergies.

Outside K.S.’s house, Cho tells Jane to stay put.

Rigsby and Van Pelt talk to the director of operations, Adam Reed, the same suit Jane dressed down the day before.

Cho hops the fence and draws his gun to sneak up around the back of the house.

Reed says he doesn’t know anything about Seung but they can ask the cleaning staff. He’s dismissive and acts better than the cleaners. He also calls his secretary “my girl” and insults her coffee fetching abilities.

In the house, Cho walks up on a roomful of gangsters playing video games. He pulls K.S. into the kitchen and asks him if he killed David Seung. When K.S. laughs at him he throws him around. He takes some convincing, but K.S. says he didn’t kill David or hurt Cho’s girlfriend.

He says a month ago David called wanting to buy a lot of cocaine. He said it was a one time thing. Cho thinks he’s lying and prepares to take him in but goes into the living room to find K.S.’s guys have Jane at gunpoint.

Jane tries to convince the bangers they don’t want the headache of killing a cop. Then he tells Cho he doesn’t want to kill K.S. either, because he’d never find out if he killed David.

Everyone lowers their guns and Jane and Cho turn to leave. Jane takes the paper with the numbers on it out of his pocket and shows them to K.S., who doesn’t seem to recognize them.

Cho and Jane grab lunch and are soon joined by Rigsby, who says David’s tox screen was negative. Cho is convinced K.S. killed David but Jane points out he had no motive. Jane suggests that if David wasn’t using or dealing, they should find out who got the drugs. (And he also shows Rigsby the two-headed coin he used to win the bet.)

Cut to Crystal the secretary stepping into the ladies room for a midday snort. Van Pelt finds her there. In interrogation she tells them David got her the drugs, but she’s lying. She’s scared to talk, saying he’ll hurt her. She says he likes to get high then beat her and have sex. It’s her boss, Adam Reed. He got the drugs from David.

She says Adam caught David stealing a laptop and blackmailed him into getting the drugs. Jane takes the numbers into Crystal, who asks how she got them.

Back at the office building, Cho, Rigsby and Jane hear laughter late at night and find Reed doing lines with a woman in a conference room. They let the woman leave.

They sit Reed down. When he says he had nothing to do with David’s death, Cho slugs him. Jane pulls out the sheet of numbers again. They’re passwords to the accounts of the firm’s wealthiest clients. David was stealing them when he was killed. Jane guesses that Reed wanted David to steal them. Reed protests, saying he had nothing to do with it. Cho starts roughing him up, but Rigsby tells him to calm down.

Out in the hallway David’s janitor boss Frank hears them. When Reed insists all he did was buy drugs off David, Cho marches him out of the conference room, blocking Jane and Rigsby inside.

Frank lets them out, pointing them in Cho’s direction.

Outside in the parking lot, Cho knocks Reed to the ground and pulls out a gun. He looks around and from inside we hear gun shots. Frank follows Jane and Rigsby, unlocking doors for them.

Outside they find Cho standing over Reed, who has blood all over his shirt. Cho tells them Reed wouldn’t talk and made him mad. He tells Rigsby to put the body in the car. Frank says he can say he didn’t see anything.

Jane tells Cho that Reed must have been innocent if we didn’t talk, then he turns to ask Frank’s opinion. Clearly, the game is afoot.

Frank professes innocence. Jane pulls out the numbers and says he doesn’t believe him. Cho asks Frank why he’s wearing gloves. He says he’s working, but Cho knows he’s not. He thinks he has cuts and bruises on his knuckles from beating up Elise.

Cho says he’ll shoot him if he doesn’t confess. Cho points the gun at him. Frank drops to his knees and spills. He tells them where to find the gun he used.

Jane believes him. Rigsby brings a very much alive Adam Reed from the truck.

Flash to Cho knocking Reed out and pouring fake blood on Reed, then firing his gun into the ground.

Jane talks Cho down and he puts away his gun. But he socks Frank.

Back at HQ, they’ve figured that Frank didn’t hire David to give him a second chance, he hired him to steal for him. And then he threatened to report he’d broken his parole if he didn’t go along. Frank says David was going to quit and wanted out of it. Frank thought he was going to tell the cops. He gives them the name of the other guy who broke in on Cho with him.

Later, Cho apologizes to Reed for accusing him of crimes he knew he hadn’t committed and for assaulting him several times. Reed and his lawyer are getting excited about their lawsuit when Lisbon brings up the sexual assault and drug charges they can levy against him. Reed backs down.

Back home, Cho checks on his girlfriend.

Then he goes to see David Seung’s grandmother. He tells her he was wrong about David; he had changed. He tells her that David called him. He apologizes and asks for her forgiveness.

Patrick Jane and the CBI team investigate when the body of a high-end luxury car sales woman is found in the trunk of a Bentley in the dealership’s showroom.