Violent memories and relationship-threatening secrets add additional burdens on Sam and Dean as they investigate all things that go bump in the night. Bobby gets a visit from Sheriff Jody Mills, who offers to clean up the cabin and cook some food for him. Before Dean can kill him, Crowley arrives, having been alerted to the demon's plans by Jackson. Sam, Dean and Garth investigate the case, and find out through a translator that the monster is targeting the children of the owners of a local brewery. For instance, when the knocks the blade out of Dean's hand, it immediately glides back into his hand. Castiel finds him in time to save him, but fails to heal him. The brothers eventually find the Leviathans in Iowa but are arrested by local law enforcement.
When he gets up, and moves to get a beer, the diary is thrown onto the floor and a card falls from it, with a number of the hunter who can help him. However, this mystery might hold some dangerous implications for Sam, whereas Dean and Frank come to bond over their respective tragedies. While Dean pairs up with , who is a hunter as well, Sam pairs up with Sheriff Mills, in finding a way to bring Dean back to the present and kill Cronos. Castiel refuses to help and disappears to get the game Twister. Garth at first believes it's the ghost of a local legend and torches her bones, however, to his surprise, there is still another dead body reported, hence he decides to call Dean for help. However, one criticism from reviewers was of the lack of an emotional link between the as a whole and the Winchester brothers, an element which had been present in previous seasons.
While being carted off in an ambulance, both brothers receive a shock: Sam is still seeing Lucifer and starts to seize, and Dean learns that the ambulance is taking them to Sioux Falls General Hospital. Eventually, Dean's night of promiscuity with the woman he met in the bar The Cobalt Room , leads to a daughter being born to her, who is destined to kill her father. When one tries to kill Castiel, Meg kills her. Or would he like to hear the verdict? Dean strikes up a conversation with a local named Lydia , and the two go back to her place. Throughout, the Leviathans are shown to maintain an eye on the various rocker aliases of the brothers, using the aliases to catch up to them.
Bobby leads them to the remains of Van Ness' victims, including Annie, and they burn them, putting them all to rest. Dean and Castiel confront Dick in the lab, but when Dean stabs him through the heart with the weapon, it fails to kill him. Meg takes up a job in the hospital, to support Castiel, and look after him. Afterwards, Castiel agrees to help, and Dean has Meg crash the Impala into Sucrocorp to attract the guards' attention while he, Sam and Castiel sneak in. The brothers learn that each victim was connected to Donald Stark , a wealthy businessman, philanthropist and pillar of the community. Kevin displays the ability to read the tablet which contains information about the Leviathans, but he has a hard time with it.
At the hotel, however, Sam and Dean are confronted by one of the Leviathans, who had been tracking them for days. Eventually, when they are about to leave the motel they were staying in, Dean goes back to get Bobby's flask that he left behind. Before the slippers take their hold, Sam and Dean find the antiques dealer who sold the slippers, and multiple empty curse boxes, as he had sold three other cursed objects. Sam refuses, and acknowledges Dean has been treating him like a hand grenade, and emphasizing that he is managing his hallucinations and atoning for his past actions. Meanwhile, Sam, tired from forced sleep deprivation due to Lucifer haunting him, inadvertently attracts the attention of Joyce's assistant, George, while getting a coffee.
It is then shown that Bobby is present through the flask, but Dean's inability to see him saddens him greatly. Bobby, watching everything, is then attacked by another Leviathan and brought to Dick, who reveals that he plans on eating Bobby in the future, but plans to use him to lure in Sam and Dean. Sam and Dean reconcile their differences over Dean killing Amy and leave town, once again hunting together. Dean manages to catch up to Sam and get the truth to his disappearance, and urges Sam to find Amy and kill her. Meanwhile, Bobby is showing greater signs of becoming a vengeful spirit.
Charlie successfully hacks the drive, but learns the truth about the Leviathans and Roman from reading Frank's files on them and then witnessing her boss, Pete , get eaten and replaced by a Leviathan. Death decides not to punish Sam, Dean, and Bobby for binding him and instead reveals to the group that the entities Castiel is struggling with are the , God's first creations. Nora exorcises the demon from her son and the brothers return to the motel to rest. Dean and Castiel find themselves in Purgatory surrounded by monsters, and Castiel disappears on Dean. In the process, though, Maggie is killing people connected to 'helping' Donald set up a fling with one of the victims. They find an unusual case involving similar murders that happen every few years in various places, eventually linking them to , the Greek of Time.
Sam and Dean unsuccessfully summon Crowley. Sam eventually tracks down the monster as an old acquaintance, , who years ago he had a crush on while hunting Amy's mother. The seventh season had an average viewership of 1. The group makes its way to Rufus' Cabin where they ward themselves from angels, and Kevin sets to work on translating the tablet. Meanwhile, Sam continues to see Lucifer and questions if the world he sees is real or if—as Lucifer claims—he is still in Hell.
Getting the paranoid Frank to dig into the company and its subsidiary, Dean discovers that it is a Leviathan front. After locking away the cursed objects, the dealer reveals that his mother collected the objects presumably being a hunter , and was recently killed in a car crash after selling her store to a realtor named Joyce, who has recently been buying up several properties in town. However, the guilt of his actions make him leave. Castiel kills the demons, and along the way, gains back his memories. Sam, eventually accepting Lucifer's help, finds this out by threatening Nora, who was forced to help Jeffrey when she learned her son was kidnapped.