The CW has released the official description for the Feb. 9th installment of Supernatural titled "Regarding Dean".
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Season 12 Episode 11 "Regarding Dean"
DEAN LOSES HIS MEMORY
Sam (Jared Padalecki) enlists Rowena’s (guest star Ruth Connell) help to track down an old world, powerful family of witches after Dean (Jensen Ackles) gets hit by a spell that is rapidly erasing his memory.
Sam (Jared Padalecki)
Dean (Jensen Ackles)
guest & recurring cast:
Rowena (Ruth Connell)