Dean makes a deal with Death on the midseason finale of Supernatural.
Titled "Appointment In Samarra," the December 10 installment will feature the return of Julian Richings in the aforementioned dark role. He'll agree to help get Sam's soul back if Dean simply takes on his job for a day.
There's just one problem: Sam doesn't want his soul back, and he makes a deal of his own with Balthazar. Check out the official promo for this episode here: