Set at the end of the 28th century, the human race has long since abandoned a desolate earth, colonizing Jupiter's moons, particularly Ganymede (moon). Most of the refugees fleeing earth did so in exchange for an agreement of indentured servant, projected to last "at most" one or two generations. However, this proved untrue, and by the 28th century a large portion of the population are in permanent debt bondage from birth. Naia (Tara Strong) is one such debt slave, genetically modified to have enhanced lung capacity in order to survive harsher work environments.