In a parallel universe in 1969, the space race between the Soviet Union and the United States is heating up, entering a new phase filled with challenges, huge goals, and amazing scientific discoveries.
Almost a decade after the moon is explored, a sudden solar storm puts the Jamestown astronauts in grave danger. As Margo takes on a difficult mission, a conflict on the moon prompts NASA's officials to consider arming the astronauts.
Ten years after their last adventure, a new expedition presents Edward and Danielle with new challenges and competition. However, dangers force them to make fateful decisions amid a challenge that has begun between the planets and the stars.
The team is still struggling with a shortage of resources in season four as they attempt to finish their mission and provide useful outcomes.