Jiawei finds a mysterious vial in her late mother's fridge that transforms her into their ancestors and descendants.

Jess and Hannah, who made a pact at 13 to have the perfect senior prom. Despite the impending changes that college will bring over the next four years, the two are committed to honoring their prom pact. But with only 24 hours left before the big event, everything falls apart when they break up with each of their dates. Jess and Hannah are left with one night to find new dates and live out their middle-school fantasies.

Zed and Addison are beginning their final year at Seabrook High in the town that’s become a safe haven for monsters and humans alike. Zed is anticipating an athletic scholarship that will make him the first Zombie to attend college, while Addison is gearing up for Seabrook’s first international cheer-off competition. Then suddenly, extraterrestrial beings appear around Seabrook, provoking something other than friendly competition.