Dean wakes up in his own coffin. How did he return from the dead? What caused the hand-shaped welt on his shoulder? And what happened in the four months he spent in Hell, time he can't remember?

After Dean's encounter with Castiel, Dean, Sam and Bobby brush up on their biblical lore when they're attacked by the vengeful spirits of people from the Winchesters' past. They're warned it's a sign that someone is trying to break seals which will bring on the apocalypse.

Back to the future, Castiel sends Dean to 1973 Lawrence, Kansas, where he meets a nice young couple named John and Mary Winchester. Dean's parents. And Mary has a secret.

Dark powers. Dean fears Sam is using his paranormal gifts in conflict with God's plan. And an ordinary guy in an ordinary town gets a major case of the munchies. It starts with steak - and moves to human flesh.

What happened to Sam during the months Dean was dead? During the search for a girl named Anna Milton, who has a mysterious connection to angels, Sam reveals the astonishing events of the summer.

"I'll Kill her gentle." The angels want Anna dead, so Sam and Dean go on the run with the frightened girl, determined to discover the secret that has set the furies of Heaven on her.

Aging magician The Incredible Jay performs the dangerous Table of Death trick and emerges unscathed. Jay cheated the Grim Reaper, but one of his rivals didn't. He checked out while Jay was doing his act.

In a small town in Iowa, three loving husbands kill their wives. Turns out these guys believe in spreading their love around: Each is spending plenty of the family income on strippers at a nearby nudie bar.

Can torture be God's work? After seven angels are mysteriously murdered, Castiel and Uriel demand that Dean use the agony-inducing skills he learned in Hell to extract information from Alastair.

Dean and Bobby have something frightening locked in Bobby's panic room: Sam, contaminated by demon blood. But as the apocalypse draws nearer, Bobby wants to free Sam to battle on their side.

The brothers prepare to fight the forces of the apocalypse in different camps. While Sam and Ruby hunt down Lilith, Dean joins Castiel and Zachariah to take on Lucifer.

A search for the one thing that may give the Winchesters an edge against God leads Sam and Dean to Jo’s door and to a secret that may have died with Ruby. Meanwhile, Castiel asks Jack to do the unthinkable to help the brothers in their quest.