“Supernatural” (9 p.m., The CW): The emotional roller coaster that is

“Supernatural” (9 p.m., The CW): The emotional roller coaster that is “Supernatural” has the Winchester boys (Jared Padalecki, Jensen Ackles) setting out to wreak vengeance on their most formidable enemy: Dick Roman (James Patrick Stuart). The episode follows the turbo-charged season finale of “Nikita.”

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