Sam is shocked when his childhood imaginary friend Sully makes an unexpected appearance. Sam can’t understand why he’d see Sully now but what’s even more surprising is that Dean can see him, too. Flashbacks reveal young Sam’s friendship with Sully and why he needed him.

Mary asks Sam, Dean and Castiel for help on a case she’s working but neglects to mention the British Men of Letters are involved. When Mary is double crossed, everything is revealed.

Alicia Banes calls Mary for help after her mother, Tasha, goes missing. Sam answers Mary’s phone and he and Dean head out to help Alicia and her twin brother, Max, find their mother who was hunting a powerful witch. Meanwhile, Mary starts to have some doubts about the British Men of Letters.

As Sam and Dean continue their search for Jack, with Asmodeus hot on their trail, they stumble across a familiar foe. Meanwhile, Lucifer manages to escape Michael’s grasp and finds himself an unlikely and mostly unwilling ally.

Gabriel is back and drags Sam and Dean into his plot for revenge on the demigods who sold him to Asmodeus. Meanwhile, Jack's inflating confidence leads to reckless decisions that could put others in harm's way.

Sam finds a clue to Dean’s whereabouts, so he, Mary and Bobby set out to investigate. Castiel imparts some sage advice on Jack, who, still desperate to belong, seeks out a familial connection.

Sam and Charlie team up to get to the bottom of a string of random disappearances. Meanwhile, Jack believes that he has found a case and convinces Dean to partner-up with him on the hunt.

Sam and Dean’s routine case turns out to be anything but.

Sam, Dean and Castiel’s continued search for a way to defeat Chuck leads them to unexpected places and toward unlikely allies.

Sam and Dean respond to a frantic call and together along with Castiel, Jack and Jody, assist in an extraordinary and heartbreaking rescue. Billie surprises everyone with a visit to the bunker.

With the plan in full motion, Sam, Dean, Castiel and Jack fight for the good of the common goal.