Baby (Supernatural)

As Sam (Jared Padalecki) and Dean (Jensen Ackles) wash Dean's Impala, the brothers discuss their lack of success in finding the Darkness. Sam proposes taking a case in Quaker Valley, Oregon, where a local sheriff was found mauled in the woods. Believing it might be a werewolf attack, and wanting to get out on the road again, they decide to investigate despite a lack of solid evidence. On the road to Oregon, Castiel (Misha Collins) calls, telling Sam and Dean that he can't find any information on the case. Trying to help him recover from his experience in the previous episode, Sam and Dean insist that he rest, with Sam offering Castiel his room and Netflix to keep him occupied.

Despite Sam's objections, Dean pulls over to a roadhouse that he had an affair at several years ago. Telling Dean to have fun without him, Sam says that he is going to do more research on the case. In the morning, Dean discovers Sam with a girl, Piper, in the car, who departs after an awkward meeting. As she leaves, she accidentally drops her hairpin in the backseat. Teasing Sam about his one-night stand, Dean puts on Bob Seger's "Night Moves" as the brothers drive away from the roadhouse. Later, the two discuss their opinions about settling down; Dean says that one-night stands are all that hunters can ever have, while Sam still thinks that they might be able to achieve something more meaningful. Sam falls asleep in the backseat of the car, and seemingly awakens to the sight of a younger version of his father, John Winchester, sitting in the driver's seat. John tells Sam that he is there to deliver a message: that the Darkness is coming and that they are the only people that can stop it. Sam tells John that he needs to provide some clue as to how to stop the Darkness, but John merely states that "God helps those who help themselves." Sensing that John is not who he says, Sam asks who he really is, but before he can answer, Sam is woken by Dean. Sam tells Dean about his vision, but Dean merely dismisses it as a dream, telling him that he also frequently dreams about their father. Sam remains unconvinced, believing that it may be a message from God.

When Sam and Dean finally reach their location, they discover the corpse of the sheriff to be mauled and his heart missing. Dean coins the term "were-pire" to describe the creature that attacked the sheriff, while Sam gets a copy of the report from the sheriff's replacement, Deputy Donnelly. Donnelly recommends a restaurant to the brothers, who decide to check it out. When they get there, they discover that it is valet-parking only, and Dean is reluctant to surrender the car to the valet, Jessie. Jessie takes the car apparently to be parked, but leaves the restaurant and cruises in the Impala with her friend, who leaves her purse in the car. When she returns to the restaurant, Dean, oblivious to her adventure, grudgingly praises her for taking good care of the car. Dean takes Sam to the sheriff's office to ask if his wife had seen anything suspicious, while Dean returns to the area where the body was found, feeling something is not right with the crime scene photos. Dean is contacted by Castiel who tells him that the creature that attacked the sheriff might be a Whisper, and the only way to kill it is to shoot him with silver bullets or beheading. After Dean tells Castiel that he has discovered that the crime scene was staged, deputy sheriff Donnelly stops by and, after apparently friendly chat, attacks Dean. As Castiel explains the lore behind Whispers, Dean and the deputy fight around and on top of the Impala, until Dean decapitates him. Finding the sheriff's head to still be alive, Dean puts it in the freezer in the backseat and send a picture to Castiel for further research. Dean calls Sam, who says that he got jumped and managed to escape, taking the unconscious Mrs. Markham with him. As Dean goes to pick him up, he drops the machete that he used to decapitate the sheriff under the front seat.

Castiel calls back to inform them that the creature is a Nachzehrer, a ghoul/vampire-like creature. The only way to kill is by placing a Charon's Obul (a coin in ancient Greek mythology) or a copper coin in its mouth, to serve as currency to take it to the Underworld, and sever its head. He also adds that if they kill the alpha, the rest of the pack will return to being human. Sam and Dean realize that they need to find pennies minted pre-1982, as after that they were no longer made of copper. Sam goes to a market to get change, while in the backseat Mrs. Markham regains consciousness. Revealed to be a Nachzehrer, and that she killed her husband, she knocks Dean unconscious and drives off with him, abandoning Sam. She drives to the body of the deputy sheriff Donnelly and reunites him with his head, and he drives off with Dean and Mrs. Markham in the car.

When Dean regains consciousness, Donnelly tells him that he is building an army to fight the Darkness, who will kill everyone unless stopped. Dean finds Piper's hairpin and unlocks his handcuffs, and grabs the alpha, causing the car to smash into a roadblock. He finds Jessie's friend's purse in the car, which has pennies in it, places a coin in the alpha's mouth. Using the machete he dropped earlier and the door of the Impala, he decapitates the alpha and cures all of the transformed Nachzehrers. With Mrs. Markham's humanity restored, she asks Dean to help her find her children, to which he obliges, figuring Sam is somewhere nearby. Returning to the former Nachzehrer nest, where all of the creatures have returned to human form, Dean picks Sam up in the car as they discuss the impact the Darkness is having on monsters as well as humans. Agreeing to stop the Darkness, Dean tells Sam that they need to go home, to which Sam replies, "We are home," affectionately patting the Impala. As the brothers drive back to the bunker, "Night Moves" once again comes on the radio as the screen fades to black.