Sam (JARED PADALECKI) fights Death in the season premiere, while Dean (JENSEN ACKLES) sends out a call for help to the angels - and gets a lethal response from the fallen legion.

Sam and Dean kidnap Crowley (MARK A. SHEPPARD) much to the dismay of Kevin Tran (OSRIC CHAU). But Abaddon (ALAINA HUFFMAN) is out for Crowley's blood as well.

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.

Recurring guest star FELICIA DAY returns as hacker/hunter Charlie Bradbury to help Sam and Dean with an ancient computer...and Dorothy from Oz.

Investigating bizarre murders, Sam and Dean look up a spell that allows Dean to "communicate" with the only eyewitness to the gruesome deaths - a German Shepherd.

Living life as a human, Castiel (series star MISHA COLLINS) asks Dean to help with a local case. Meanwhile, Sam and Kevin work with Crowley to decipher the tablet.

Dean gets a call from an old friend who runs a home for delinquent boys, where Dean was sent when he was younger. Together with Sam, they try to stop a ghost.

Sheriff Mills (KIM RHODES) calls Sam and Dean for help investigating multiple murders tied to a church chastity group. When Sam and Dean infiltrate the group, Dean disappears.

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.

While trying to free Sam, Castiel suggests they try to separate Sam's brain from the angel's but the only person who knows how to do that is Crowley.

Looking to return as King of Hell, Crowley asks Dean for help finding "The First Blade," the only blade that can kill Abbadon - currently owned by Cain (TIM OMUNDSON).

After learning that Garth (DJ QUALLS) is in the hospital, Sam and Dean check on him, but Garth hightails it away. Following him, Sam and Dean are stunned by what they find.

Suspecting witches, Sam and Dean go undercover at a fancy day spa where the victims literally had all the fat sucked out of them until they died.

When Sam and Dean discover that the Men of Letters' bunker is haunted, their investigation leads them to a storage facility where the demons have been keeping a prized possession.

While investigating a teenage girl murdered by a ghost, Sam and Dean encounter another team already on the case... the Ghostfacers! (TRAVIS WESTER & A.J. BUCKLEY).

Instead of helping Sam and Dean search for the Frist Blade, Crowley sinks deeper into his addiction for human blood, putting everyone at risk from Abaddon.

Metatron (CURTIS ARMSTRONG) attempts to get Castiel to join forces with him, Castiel refuses, setting a surprising plan in motion. Meanwhile, Sam and Dean capture Gadreel.

Sheriff Mills calls Sam and Dean after she rescues a girl named Alex who was kidnapped by a family of vampires that used her as bait to lure in humans to feed on.

Sam and Dean investigate a case, where they discover that various mafia-esque monster families are, unknown to humans, running Chicago's criminal underworld.

After Castiel captures one of Metatron's angels, he asks Sam and Dean for help with the interrogation. Meanwhile, Abaddon demands Crowley help her kill the Winchesters.

After a massive attack on the angels, Castiel is shocked to learn that one of his followers caused it in his name. And at the heart of it is Tessa, the Reaper.

In the ninth season finale, Dean feels the effects of the First Blade, and Metatron makes his move against humanity - while Sam, Dean and Castiel face the consequences.