Faced with impending doom from a planet-killing asteroid, a couple flee to the hills of Tennessee to spend their last days together - but the chaotic breakdown of society disrupts their peaceful plans.
Former high school friends run into each other years later and drunkenly decide to make good on their promise to marry each other if they're both still single by 30 - only to discover too late all the things they liked about each other when they were younger have changed.
