Dean and Sam walk into a bank and Dean tells his brother to trust him. He then goes tthe counter, flirts with Megan the teller, and asks for change for a $100. Dean and Sam then pull out guns and tell everyone to get into the vault. They then open fire and kill everyone, making sure that they're captured on camera.
At a hidden cabin, Bobby injects the captive Chet with various substances to get him to talk, but nothing affects him. When Sam and Dean arrive, Chet informs them that Edgar is still alive, despite the fact that they dropped a car on him. He explains that he tracked them using pattern recognition software and the knowledge of their aliases they obtained from Castiel's mind, and informs them that he's the least of their concerns. Chet tells them to watch the news and they tune into a broadcast of Sam and Dean killing the people in the bank. They realized that the Leviathans duplicated them, and Chet calls out that they were able to get some hair samples from a shower drain. Sam figures the Leviathans are trying to discredit them and Bobby says that they have to stay in hiding rather than go after them. The brothers insist on dealing with their duplicate and Bobby sends them to talk to Frank Devearux, an old friend.
The brothers head for Frank's and stop for gas. Sam goes inside to get food and realizes that the cashier has recognized them from the newscasts. He quickly drives off with Dean before the police can arrive.
FBI special agents Morris and Valente arrive at a new bank shooting but get word that Sam and Dean have been spotted over a thousand miles away, and head out to investigate.
Dean and Sam arrive at Frank's. The house appears deserted and the door is unlocked. The brothers go inside and find Frank waiting, holding a gun on them. He figures they're the real Winchesters, not the doppelgangers, and asks who they are. When they finally confirm that Bobby sent them, Frank disgustedly accepts who they are and that he owes Bobby for saving his life. He then takes them into his workshop where he has dozens of monitors tuned into the Internet. The brothers ask for help and Frank says that he can wipe all of their IDs, but they'll have to stay out of sight of any security cameras, and insists that the government is monitoring all of them. He then smashes Sam's laptop and gives him a new one, demanding $5,000.
Bobby keeps trying to find something that will hurt Chet but has no success. Chet warns that once the spell wears off, he'll break free and eat first Bobby and then everyone he knows. Angry, Bobby successfully decapitates him.
The next morning, Frank gives the brothers a list of the banks that their duplicates have hit. Sam thanks him but Frank says that he's sending them to get killed. He also warns them to lose the Impala because the duplicates are using one as well.
Sheriff Mills shows up at Bobby's doorstep with beer and tries to thank him. He invites her in she wonders how he's doing given that his house has been burned down, but Bobby insists that he's fine. Mills offers to cook and he agrees, and then goes downstairs to check on Chet. He discovers that the head has crawled back and reattached itself, and Chet says that it won't be that easy. Bobby agrees but says that it's a start and decapitates him again.
Dean and Sam drive off in a new car, but Dean isn't happy that the "baby" is locked up. Sam finally realizes that their duplicates are hitting the towns that the brothers originally worked after they got back together. They head for St. Louis, the next town on the list, and Dean looks forward to stopping at his favorite diner.
The duplicate Sam and Dean are eating at the diner and discussing their originals' issues. They wonder why the Winchesters are so important, but they have no choice but to obey orders. The duplicates then tell one of the patrons to start taking video of them and then pull out guns and take everyone hostage.
Bobby calls to tell Sam and Dean that decapitation will slow the Leviathans down. They hear Mills in the background but Bobby denies that he has a woman there. He then tells them that their duplicates have already struck in St. Louis, and the brothers figure they're heading for Ankeny, Iowa.
Morris and Valente arrive in St. Louis and check out the diner. They see the footage of the brothers killing people, finishing up with the cameraman. They then address the camera, saying that they're heading for Iowa.
As Bobby prepares to try electricity, he brushes Chet's arm and the Leviathan transforms into Bobby, with all of his memories. The creature taunts Bobby with how sad his life is.
Sam and Dean arrive in Ankeny and spot their doppelgangers. They call Bobbybut he admits that he doesn't have anything better than decapitation. Before the Winchestres can move in, the police arrive and arrest them, just as their duplicates planned.
Bobby's doppelganger tells Bobby that he just pretends to be a cynic, and that he has hopes to end up with Mills. The doppelganger asks why he bothers, and Bobby picks up a machete and prepares to cut him. Before he can say anything, fluid drips down from the ceiling onto the doppelganger, causing him to scream in pain. Bobby goes up and finds Mills cleaning the floor. He kisses her and then asks what was in the bucket.
Sam and Dean demand a phone call but the sheriff puts Dean in a cell and sends Sam to the interrogation room. Outside, their doppelgangers take on the form of deputies, go inside, and start killing officers. Meanwhile, the sheriff goes to see Dean, who insists that he's innocent and asks for one phone call. The sheriff relents and calls Bobby, trying to explain what's going on without giving things away to the sheriff. Bobby tells him that the Leviathans are vulnerable to sodium borate. The sheriff listens in and finally cuts off the call, thinking that Bobby and the Winchesters are nuts. However, when he goes back to the squad room, he sees two of his deputies eating the others. As the sheriff watches, they transform back into Sam and Dean. He goes back and frees Dean, who tells him to find anything with sodium borate in it.
The Dean doppelganger finds Sam locked up in the interrogation room and goes inside, explaining who he is.
Dean grabs a gun from one of the dead deputies and runs into the Sam doppelganger. It easily disarms him and throws him against the wall.
The Dean doppelganger tells Sam how much he's grown to them, and says that they could be so much more if they weren't worried about doing good.
Dean goes for a fire axe and the sheriff throws sodium borate on the doppelganger, giving Dean the opportunity to decapitate it.
The Dean doppelganger tells Sam that Dean thinks he's insane and killed Amy, and then enjoys the look of shock on Sam's face. It prepares to eat Sam, but Dean breaks in, douses it with sodium borate, and decapitates it. The sheriff frees Sam and agrees to help fake their deaths when the FBI arrives. Sam hesitates and Dean asks if he's fine, and Sam says that he is.
Later, the sheriff and his daughter, the coroner, tells Valente and Morris that he got the drop on the brothers and shot them, and then sent their bodies to the crematorium. The agents are unhappy that there are no bodies, but decide to take the easy way out and close the case.
Mills prepares to leave and Bobby thanks her for the help. He then says that there's one more thing. He gives her Chet's head and asks her to toss it in the river, and then kisses her on the check. Mills smiles and leaves.
The sheriff's daughter is examining the body and telling her father that it's not human. Agent Valente returns and says it doesn't matter, and then reveals that it's a Leviathan and eats them. He wraps up the corpses and then calls his boss, Ricahrd Roman, and explains that the Sam and Dean doppelgangers were decapitated and their heads were taken. Roman figures that they can't try the same thing twice without giving things away to the media.
Roman gets into his limo and finds Crowley waiting for him. Crowley introduces himself and suggests that they should work together. When Roman wonders why, Crowley points out that he opened the portal. However, Roman isn't impressed and says that he isn't interested in working with demons, which he considers lower than humans. Crowley considers and then teleports away.
Dean and Sam pull over to dump the heads, but Dean soon realizes something is bothering his brother. Sam finally tells his brother that he knows about Amy and then walks away, saying that he can't be around Dean right now. He tells Dean to go on without him, and Dean apologizes and drives away.