"Survival Of The Fittest" -- Pictured (L-R): Jared Padalecki as Sam and Misha Collins as Castiel in SUPERNATURAL on The CW. Photo: Jack Rowand/The CW ©2012 The CW Network. All Rights Reserved.

"Survival Of The Fittest" -- Pictured (L-R): Jared Padalecki as Sam and Misha Collins as Castiel in SUPERNATURAL on The CW. Photo: Jack Rowand/The CW ©2012 The CW Network. All Rights Reserved.