In tonight's "very special episode" of Supernatural, "The Curious Case of Dean Winchester," fan favorite Bobby Singer makes a bet with a demon in order to regain some of his youth and health back.

Supernatural showed the audience that Sam and Dean were really set on going separate ways and not just pulling another quick time apart. Dean hunted while Sam got a job

Thanks to his injuries in the season premiere of Supernatural, Bobby was stuck in a wheelchair. Castiel showed up and explained that he was now a rebel angel

Aside from season two, the past three season finales of Supernatural have ended with a cliffhanger. The season four finale started with the usual quick season recap

Sam and Dean have been building towards a confrontation since the first episodes of Supernatural season four. With Sam's constant lies about what he's been up to

This season on Supernatural, the show introduced the angel Castiel as an important new character. As far as the body he was borrowing,

The promo for tonight's episode of Supernatural is centered on a young guy claiming to be Sam and Dean's long lost brother. For those that don't know, Jump the Shark

The inspiration for tonight's episode title comes from a Sesame Street book with a memorable ending. The main character of the book Grover is obsessed with figuring out who the monster is

Dean, or Bizarro Dean wakes up and heads to work in a suit and tie. He listens to National Public Radio. He's Dean Smith, who eats salads for lunch and worries about dieting.

On last week's "Supernatural," Dean (Jensen Ackles) gets shot and killed while investigating the disappearance of a man with Sam (Jared Padalecki). Things get a little crazy when Sam wakes up the next morning to find Dean alive and well. What's even crazier is that Sam keeps reliving that Tuesday over and over...and over again.