Leonard: The four of us are here to prevent the apocalypse. We - and when I say, "we", I mean everyone in this cabin, can stop it from happening, but only with your help. Ultimately, whether the world ends or not is completely up to you three.

Andrew: You are having a psychological break of some kind.

Leonard: Your family must choose to willingly sacrifice one of the three of you in order to prevent the apocalypse. After you make what I know is an impossible decision, you must then kill the one you choose. If you fail to choose, of if you fail to follow through with the sacrifice, the world will end. You three will live, but the rest of humanity, seven billion plus... will perish.

Eric: They're lunatics.

Leonard: And you will all live long enough to witness the horror of the end of everything. And you will be left to wander the devastated planet alone. Permanently and cosmically... alone.

Andrew: Leonard. We haven't done anything wrong.

Leonard: I agree with you. You haven't. You haven't done anything wrong to... to deserve this burden. You're just the family chosen to decide for us in this time.