6.11 - Appointment In Samarra

Dean goes to Dr. Robert to have a 3 minutes near-death experience to meet Death. They have a meeting and Death proposes Dean to wear his ring for 24 hours; in return, her would bring Sam's soul back and put a wall to isolate his traumatic period in Hell. Dean plays Death with Tessa and soon he learns that the natural order cannot be violated. Meanwhile Sam summons Balthazar to have a spell to avoid having his soul back and he needs to kill Bobby for the spell work.

Source: IMdb