In order oo prevent the end of the world before it ever starts, Anna travels through time (Terminator style!) to murder Sam's parents before they conceive him.
This cause a major problem for the brothers, of course. They must stop her.
Dean: What exactly are we gonna march up there and tell 'em?
Sam: Uh, the truth.
Dean: What, that their sons are back from the future to save them from an angel gone Terminator? Come on, those movies haven't even come out yet.
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Dean: Really? Anna?
Castiel: It's true.
Dean: So she's gone all Glenn Close, huh? That's awesome.
Castiel: Who's Glenn Close?
Dean: No one. Just this psycho bitch who likes to boil rabbits.
Sam: So, the... the plan to kill me--would it actually stop Satan?
Dean: No, Sam, come on.
Sam: Cass, what do you think? Does Anna have a point?
Castiel: No. She's a... "Glenn Close."
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