Erica, Alan, Denver, and Trish are the first four people to be born on Mars. They are waiting to find out if they've passed "The Test," which would allow them to go outside for the first time in their lives. To pass the time, they play a game creating scenes that imagine what life on Earth would be like. As control of the game jumps from person to person, questions are raised about the truths and fictions in their own lives on Mars. Before long, it becomes apparent that the outside world isn't as simple as they've imagined.