High school was the worst time in Nick Coleman’s life, which is saying a lot given that he spent the three decades after graduation living in a post-apocalyptic hellscape. Unfortunately, he will have to relive the “good old days” if humanity has any hope for survival. Going back in time to stop a nuclear war seems like a walk in the park compared to having to live as a teenager again. If the time-traveling, cultist assassins don't kill him, the high-school drama will.