 Twenty-two years earlier than the series'main storyline, the demonic tyrant Azazel fed his blood to Sam and other infants, to imbue them with demonic abilities. He gathers them together in the second season finale "All Hell Breaks Loose" and coerces the young adults into a fight to the death to determine a leader for his demonic army. Sam is killed by the super-strong Jake Talley, but Dean sells his own soul to a crossroads demon in exchange for Sam's resurrection, a contract that leaves Dean with only a year to live. The Winchesters, Bobby, and fellow hunter Ellen Harvelle kill Jake and Azazel, but are too late to prevent the release of hundreds of demons from Hell.
