When Stargirl's mother is hired as the costume designer on a movie, they relocate to L.A., where Stargirl quickly becomes involved with an eclectic assortment of characters.

Best friends for life, Jane and Fiona have done everything together since kindergarten – Jane following wherever Fiona will lead. Left devastated and adrift following Fiona’s sudden suicide, Jane’s only way to make sense of everything is by helping Fiona’s widow Gemma care for their young son Bailey. Polar-opposites, the two women have nothing in common save for their shared grief and love for Fiona.

Josh Futturman, a janitor by day/world-ranked gamer by night, is tasked with preventing the extinction of humanity after mysterious visitors from the future proclaim him the key to defeating the imminent super-race invasion.