A teenage girl is killed and the final selfie she took before the attack shows a ghostly figure in the background, which brings Dean and Sam to Washington.
Sam and Dean Winchester are stunned to discover the Men of Letters' bunker is haunted by a very familiar ghost.
Sam and Dean investigate recent murders where the victims were hundreds of pounds lighter after their deaths, which leads to the two going undercover at a fancy day spa.
After finding out that Garth is in the hospital, Sam and Dean go to check on him.
Looking to reclaim his place as King of Hell, Crowley asks Dean for help finding “The First Blade,” the only blade that can kill Abbadon.
Dean's best chance of saving Sam lies with Crowley. Devastated after Kevin's death, Dean vows to find the angel that killed him, not only to free Sam, but to seek revenge. Castiel arrives at the bunker and suggests they try to separate Sam's brain from the angel's so they can talk to Sam and have him expel Gadreel. However, there's one small problem: the only person who knows how to do that is Crowley.
After a massive angel slaughter occurs, Sam and Dean run into Castiel. When Castiel is captured and tortured, Dean wonders if it might be time to tell Sam the truth about Ezekiel.
Sheriff Mills (recurring guest star KIM RHODES) calls Sam and Dean for help investigating multiple murders in her small town. Discovering all four victims belonged to the same church chastity group, Sam and Dean decide to infiltrate by joining the group themselves. When Dean disappears, Sam and Sheriff Mills realize whatever they are hunting has taken Dean too . . . and they team up to rescue him.
Dean gets a call from an old friend named Sonny (guest star BLAKE GIBBONS) asking for help with a ghost. Sonny runs a home for delinquent boys, and Dean was sent there for stealing food when he was younger. Sam is stunned he never knew this about his brother and asks for more information, but Dean dodges his questions. Another murder occurs while Sam and Dean are at the house, so they scramble to find the culprit before anyone else dies. Meanwhile, Dean looks up an old girlfriend (guest star ERIN KARPLUK) and recalls his time at the house.
Exiled from the bunker, Castiel gets a job at a Gas-N-Sip and actually starts to enjoy life as a human. A headline in the local newspaper about some disappearances in the area catches his eye, so he calls Dean to help him investigate the case. Dean knows he needs to keep Sam/Ezekiel away from Castiel, so he tells Sam that he and Kevin need to stay and work with Crowley to decipher the tablet. Crowley agrees to help Sam and Kevin… but in return he wants one phone call to Hell.
While investigating two bizarre murders, Sam and Dean realize there is an eyewitness to both gruesome deaths – a german shepherd. Anxious to find out if they are dealing with a witch, a skinwalker or other supernatural monster, the guys look up a spell that could let Dean "communicate" with the dog. Unfortunately, the spell comes with side effects that no one saw coming.
Sam and Dean discover that the table in the Men of Letters house (the one that lit up like a Christmas Tree when the angels fell), has an ancient computer attached to it. They figure if they can get the computer on, they can track the angels. Who better to call for help than the best IT girl there is, Charlie Bradbury (guest star Felicia Day)? While moving the massive computer, they dislodge a hidden hexbag that unleashes a magical green-webbed wall. Sam and Dean break through it and discover the one and only Dorothy (guest star Tiio Horn) from Oz. She had trapped herself and the wicked witch (guest star Maya M) in the web years ago to stop the witch from finding the key that would open the gate that connected their world with Oz. With the wall broken, a massive and magical fight ensues that threatens to destroy the Men of Letters bunker.
After Ezekiel tells Dean a group of angels is hunting Castiel, he and Sam race to find their friend before the vengeful angels do. Meanwhile, a homeless Castiel is trying to make his way through the city and comes across some unexpected surprises.
Abaddon Rises! Dean shocks Sam by popping open the trunk of the Impala and showing him that he has kidnapped Crowley. Kevin freaks out when he sees the King of Hell, but Sam and Dean convince him that they need Crowley to find the demons on Earth. Meanwhile, Abaddon re-emerges and plans to take over Hell.
In the ninth season premiere, Dean is frantic after Sam collapses and the doctor tells Dean his brother won't make it. Desperate, Dean sends out an "All Points Bulletin" via prayer to every angel in the area – asking them to help his brother. In exchange, Dean will owe that angel a favor. Numerous angry angels race to find and kill Dean, but one, Ezekiel (guest star Tahmoh Penikett), gets to him first. Meanwhile, Sam fights for his life, facing some familiar demons in the struggle; and Castiel struggles to survive without powers.
Writer Adam Glass discusses Sam's Demon Trial
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