Fics like It's the End of the World as We Know it (and I Feel Fine)

A Hitchhiker’s Guide to the Galaxy AU. Sam Winchester is living a happy, ordinary life on Earth. Except now his friend Castiel is saying he’s an alien, and the world is about to be demolished to make room for an intergalactic highway. Sam has no choice but to believe him, especially once Castiel promises to reunite him with his long lost brother: Dean.

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