Sam and Dean investigate a woman whose eyes were removed and run into the mysterious Styne family again. Meanwhile, Sam goes behind Dean's back to recruit Charlie and Castiel to help Rowena decipher the Book of the Damned. In Hell, Crowley talks to Olivette and finds a bargaining chip that he can use against his mother.moreless
Charlie calls Sam and Dean and tells them she found the Book of the Dead that could help remove the Mark of Cain. Unfortunately, a man who claims the book belongs to his family shoots her. Meanwhile, Castiel and Metatron take a road trip to find Castiel's grace, but the journey doesn't go as planned.moreless
The Winchesters are surprised to see a video on the Internet of Charlie torturing a district attorney. Sam and Dean go after her, and discover that she's after the man responsible for the car crash that orphaned her. However, the Charlie they find isn't the Charlie that they expect.moreless
The Winchesters call Charlie in to help them with a Men of Letters computer, only to discover a strange green-webbed wall where they find a young woman named Dorothy inside Now they trio must join forces with Dorothy to stop the Wicked Witch from either returning to Oz or bringing Oz to the real world and wrecking havoc.moreless
Dean is concerned about the physical impact the second trial had on Sam, so he insists that Sam stop hunting for a while. When Charlie comes across a case and finds the boys, Dean decides it's time to teach her how to be a hunter. However, the boys suspect she is hiding something from them that could get her killed.moreless
Sam and Dean look into the deaths of two people involved in Live Action Role Playing (LARP), playing a game named Moondoor. They discover that Charlie Bradbury is involved in the game and soon learn that someone has summoned a fairy to kill his or her enemies.moreless
In the series finale, the Department of Defense's closure of Eureka is delayed by random wormhole materializations.
The doubles steadily take over GD, which means Fargo, Allison and Zane are in a fight for their lives and everyone else's as they try to avoid capture and fix the problem.
The Department of Justice arrives to investigate Grace, and Henry struggles with his conscience. Holly receives a message that triggers a chain of events. The question is whether it's her actions or Fargo's malfunctioning signature achievement that are causing the scary incidents all over GD and the town.moreless
Carter and Allison's perfect honeymoon is interrupted when sabotage is discovered in Eureka. Elsewhere, Holly faces another hurdle to remain intact.
While under the influence of a smart drug, Carter becomes a genius like everyone else in town and starts to change the laws of physics. Unfortunately, his condition soon endangers all of Eureka, including Allison's brother who is in town just to meet his new brother-in-law.moreless
Carter and Allison's romantic plans run afoul of a rogue submarine, and it's up to Jo to save their lives … if she can fix the mess at Global Dynamics caused by an out-of-control prankster in time.moreless
The Department of Defense insists on installing new security and removing all Astraeus artifacts, but Fargo resists because he believes Holly is alive in the matrix. Elsewhere, Henry recruits Carter for a brain experiment.moreless
The brothers get word that Dick Roman has obtained Frank's hard drive and is using an unsuspecting hacker to decrypt it. While the Winchesters try to find her, Bobby tries to help them but finds himself giving in to his rage against the Leviathan CEO.moreless
After Senator Wen calls off the search, Kevin designs a tool to find the Astraeus ship that is still missing after four months. Unfortunately, the device's assembly stops after Andy and Carter are arrested while stealing a component for it. Elsewhere, Jo's walkabout is rocky, and at the Astraeus crew's location Dr. Marten posits a dangerous theory about their situation.moreless
When the ship with the Astraeus crew returns to earth, its occupants discover that four years have elapsed and time isn't the only thing that has changed.
Attacks in town may scuttle the Astraeus mission in the same week the final 20 will be named. Carter and Allison appeal the auditor's recommendation, but the proposed fix, a memory-reading gadget for the candidates' final interviews, may give them more details about each other than desired.moreless
Tiny makes an explosive reentry on the same day the Department of Defense demonstrates how little control Allison and Carter have over their personal lives by sending an auditor whose task it is to analyze their relationship. Elsewhere, Jo turns herself into a wedding planner extraordinaire for a reluctant Grace and Henry as Zane prolongs his departure, and Fargo must decide how he wants his relationship with Holly to progress. But none of it matters when it appears the gases Tiny brought back may be be the end of Eureka.moreless
Carter deals with a bank robbery which may relate to the sudden gravity issues besetting the citizens of Eureka. Meanwhile, Fargo's rivalry with Isaac Parrish is boosted when he learns Holly and Parrish went on a date.moreless