Supernatural Spotlight – Episode 6.11 “Appointment in Samarra”
This episode begins with the appearance of Robert Englund (better known as Freddy Kreuger from Nightmare on Elm Street) as a doctor who works out of the back room of a Chinatown butcher shop. He’s stitched up John Winchester many times over the years, but now it’s Dean seeking him out, for some sort of procedure which, apparently, has a 75% success rate. I’m thinking a vasectomy, but no, he’s going to go all Flatliners.

In the seven minutes that he’s dead, Dean casts a spell to summon Tessa, a Reaper (as in the Grim kind). But he doesn’t really want Tessa, he wants her boss … Death.
Dean figures that if there’s anyone they know who can get Sam’s soul out of its little hell box with Lucifer and Michael, it’s Death. And, in fact, he’s right. He tries to blackmail Death by threatening to not give his ring back (the ring was obtained at the end of last season, so that the Winchesters could trap Lucifer). Death is amused, because he knows exactly where the ring is being held. But still, he offers Dean a deal, a bet, and if successful he’ll give Sam’s soul back and put up a wall that will hold back the memories of his torments … for a time. Possibly even a lifetime.
The terms of the bet: Dean has to wear Death’s ring for a day.