Jake Talley

Background
Jake has a family, and cares about them very much. As one of the Special Children, he was visited as a child by Azazel, and fed some of his blood. He tells Sam Winchester that he discovered his ability when he moved a military vehicle off of a trapped soldier. He is able to lift extremely heavy amounts of weight, and able to send opponents flying with his punches.

Cold Oak
Jake was transported to Cold Oak while in Afghanistan. At first, he seems to be helpful, backing Sam Winchester up in attempting to fight off whatever is out there. However, Jake is visited by the Yellow-Eyed Demon and is told that he is in a competition. When Ava attempts to kill Sam with her powers, with Andy laying dead on the floor, Jake comes up from behind her and snaps her neck, killing her. He then attempts to end the competition with Sam in a fist fight, and eventually kills him with a knife to the spine.

Opening Hell's Gate & Death
Jake next encounters Azazel at a campfire in the night, having discarded his utilities for normal clothes. Azazel tells Jake that although he is not the one that he would have wanted, Jake is now going to be the head of his demon army, and directs him to Wyoming. In Wyoming, Jake is visited again by Azazel at the iron railroad outside of the cemetary. Azazel gives Jake the Colt, telling him that he will need it, and that it is the only weapon in the universe that can shoot him dead. Jake then aims the Colt at Azazel. Azazel feigns fear and goads Jake to fire the weapon, but also tempts him with promises of "health and wealth, honey and money, every day is ice cream Sunday" for him and that his family would be as "royalty" if he complies with Azazel's commands. Jake lowers the weapon and agrees. He arrives at a cemetery in Wyoming where the Devil's Gate is located inside the crypt. He is about to insert the Colt, like a key, into the a strange lock on the crypt, only to see the resurrected Sam and his compatriots. He tells Sam that there was no way he could have lived- he cut through his spinal cord. A stumped Sam turns to Dean, questioning Dean's truthfulness. Jake then begins to laugh and orders Ellen to put her own gun to her head and telepathically holds her at gunpoint (his pupils flash yellow when he does this), forcing the others to drop their weapons. After they comply, Jake turns and quickly inserts the Colt into the crypt like a key, only to be shot multiple times by Sam in his back. Sam, thirsty for revenge, casually walks to where Jake fell and, despite Jake's desperate pleas, shoots Jake multiple more times with no remorse or guilt, much to the surprise of his fellow hunters and brother as the Devil's Gate begins to open, unleashing a demon army from Hell.

Powers
Jake is a psychic child like Sam and thus gained his powers by means of Azazel dripping his blood in Jake's mouth as a baby. Jake has super strength as he lifted a turned over military trucks, benched an enormous amount of weight, and could send people flying with his punches. Jake later gained the ability to telepathically take control of others' bodies, as evidenced when he exercised this power over Ellen Harvelle by forcing her to put her own gun to her head and holding her at gunpoint.

Season 2

 * "All Hell Breaks Loose - Part 1"
 * "All Hell Breaks Loose - Part 2"

Trivia

 * By killing Sam (who Dean sold his soul and went to Hell to resurrect) and opening The Devil's Gate, Jake is responsible for putting the Apocalypse into motion.