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.
This Season Pass includes all current episodes and will include future episodes after broadcast date as they become available. After defeating the Leviathan, Sam and Dean set off on an epic quest to seal the Gates of Hell last season. Facing a series of trials, the Winchesters soon found themselves in the middle of an age- old power struggle between the King of Hell and legions of warrior angels. But with the angels cast out of heaven and walking the earth, things just got very unpredictable.
What must Sam, Dean and Castiel sacrifice in order to forever seal the gates of Hell? With Crowley poised to undo all the good they've ever done as hunters, Sam and Dean find themselves cornered. But with Kevin's help, the Winchester brothers bound into one last play against The King of Hell. Meanwhile, Metatron initiates a plan with Castiel to take on Naomi and the bureaucracy of Heaven.
As the Third Trial nears, Sam and Dean reunite with Castiel. Digging through the Men of Letters' files, they stumble upon an undiscovered film, which could be the key to the third trial. Metatron (CURTIS ARMSTRONG) enlists Cass to mull over problems at home in Heaven – but things are not what they seem. Meanwhile, Crowley digs up some familiar faces from Sam and Dean's past.
When Sam and Dean receive a distressing video message from Kevin Tran, they set about trying to uncover the Third Trial. The boys make a discovery that sends them to a casino in Colorado, to find a mysterious recluse (guest star CURTIS ARMSTRONG) who may be able to fill in the holes in Kevin's research. And while Crowley is on a winning streak, Castiel tries to elude Naomi and the angels hunting him.
Concerned about the physical toll the second trial took on Sam, Dean benches his brother from hunting until he heals up. So, when geektastic hacker Charlie Bradbury (returning guest star FELICIA DAY) stumbles upon a case and finds the boys, Dean decides it's time to teach Charlie how to be a hunter-in-training. While happy to see "her highness," the boys suspect Charlie is hiding something – a secret that could get her killed.
Sam and Dean respond to a call from Kevin, who is terrified because he's hearing Crowley's voice in his head. After hearing Kevin's news, Sam and Dean team up with reaper named Ajay (guest star ASSAF COHEN), who helps them deal with the second trial from the Tablet. Meanwhile, Dean receives a visit from the angel Naomi and realizes he must find his Purgatory friend Benny and ask for a huge favor.
Sam and Dean investigate some recent vampire kills and are surprised to learn that teenage hunter (and fan favorite) Krissy Chambers (guest star MADISON McLAUGHLIN) is involved. They find Krissy and learn her father was killed and that she's been taken in by a man named Victor (guest star ADRIAN HOUGH) – who has taken in a group of orphan kids to teach them how to hunt. Victor is helping the teenagers find the vampires who took their parents so they can get revenge. While Sam is intrigued by Victor's method of giving the teenagers a home life as well as a hunting life, Dean is suspicious of Victor's motives.