From Supernatural – Season 12 Episode 23: ‘All Along the Watchtower’ (12×23) | TV series produced by The CW
Castiel: It's a doorway to another world.
Dean Winchester: Anoth-- What, like Narnia?
Castiel: No. No, through there it's Earth, but... but different. It's a -- it's an alternate reality.
Sam Winchester: So it's a Bizarro world? Or like the place we got zapped to where we were, uh, uh, actors on a TV show.
Dean Winchester: The supernatural wasn't real. And you were Polish.
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