"Presephone" centers on three astronauts from Colony One, a space vessel carrying 20,000 colonists from a dying Earth to the nearest star system of Alpha Centauri in the late 22nd century. The trio have been dispatched to repair a system designed to shield their new world of Proxima B -- also known as Persephone -- from constant and deadly solar flares, the outpost the only option for the survival of the species. While commanding a critical mission to the planet Proxima B, shuttle pilot Darcy (Brianna Hildebrand) goes head-to-head with engineer Tanya Baxter (Mary-Louise Parker) regarding the right course of action when they discover they may not be alone on the seemingly lifeless world.