Space Ghost compares the experiences of astronauts and prisoners, using popular depictions of space travel to illustrate the physical and existential aspects of incarceration: sensory deprivation, the perception of time as chaotic and indistinguishable, the displacement of losing face-to-face contact, and the sense of existing in a different but parallel universe with family and loved ones.
Physical comparisons such as the close living quarters, the intensity of the immediate environment, and sensory deprivation, soon give way to psychological ones: the isolation, the changing sense of time, and the experience of earth as distant, inaccessible, and desirable. The analogy extends to media representations that hold astronauts and prisoners in an inverse relationship: the super citizen vs. the super-predator. Astronauts, ceaselessly publicized, are frozen in time and memory whereas prisoners, anonymous and ignored, age without being remembered.