Stacy and Lydia are BFFs who've always dreamed about having epic bat mitzvahs. But things start to go comically awry when a popular boy and middle school drama threatens their friendship and their rite of passage.

A group of teenage friends decide to make the most of their lives before the growing sun goes supernova and destroys the earth, along with everything on it.

Set against the weight of a single shared birthday, Eighteen follows five young men, Fletcher, Waylon, Ben, Wes, and Caleb, each crossing the threshold of adulthood in their own way, on the same day.