Marvin is a ten-year-old boy living in an entirely artificial lunar colony at an unspecified point in the future. Having spent his life in enclosed habitats, he possesses a strong curiosity about the outside environment. He views the upcoming surface expedition as an adventure, reacting with the innocent wonder typical of a child his age.

Marvin's father is a stern, purposeful resident of the lunar base. He holds the heavy intergenerational burden of preserving the memory of humanity's origins. He approaches his duties with intense focus, driving their scout vehicle across the moon in total silence while carrying an important message for his son.