Living on a remote moon, Dr. Paulson seeks a better life for his daughter, Mary. To that end, he tasks his android servant, Ariel, with sabotaging a passing ship containing a potential suitor for Mary, Freddy—who later reveals that he is gay. Ariel, who desires freedom above all, performs Paulson's bidding in the hopes that he will release her. Events are complicated by Mary's secret relationship with Caden, an alien also living on the moon. Caden, meanwhile, wants only to remove Paulson from the moon which he feels is rightfully his. Drawing inspiration from The Tempest, On This Moon blends the conventions of a Shakespearean comedy with a contemporary tale of greed and betrayal, love and acceptance, posing the question: what does it really mean to be human?