The secret behind Sam's odd behaviour on Supernatural has been revealed - he's lost his soul, and Dean is far from happy about it! The two brothers form an uneasy alliance to investigate what at first appears to be a werewolf killing. However, they soon discover that their quarry is a skinwalker, disguised as a family dog and bearing a grudge against his owner's enemies! Click on the vid below to get a sneak preview of ''All Dogs Go To Heaven'!
Supernatural continues on Friday at 9/8c on The CW.
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