Season 7, Episode 23 Survival of the Fittest
First Aired: May 18, 2012
The seventh season concludes with Sam and Dean battling Leviathan Dick Roman and trying to stop him from carrying out his evil plans.
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- Premiered: September 21, 2006
- Rating: TV-14
- Premise: Two brothers hunt demons, ghosts and other supernatural entities as they investigate crimes caused by paranormal forces. (more)