Supernatural (2005)

S05E21 Two Minutes to Midnight

In "Two Minutes to Midnight," Crowley offers Bobby the whereabouts of Death, the fourth horseman, in return for his soul. Understanding that Sam and Dean require this ring to avert the Apocalypse, Bobby hesitantly accepts the deal. Meanwhile, Sam and Dean face off against Pestilence, who unleashes a lethal virus, forcing Castiel to step in and assist them. Dean then meets with Death to negotiate regarding Lucifer, leading to an unholy alliance that comes at a steep cost for him.