When two new BattleField recruits, best friends Tom and Brent, intercept a missive of war, they embark on a mission to save the human race. In a very distant future, all that remains of Earth is a giant rock that was destroyed by pollution and global warming. With no free habitable planets to be found, humans live in artificial environments on Earth's surface, filtering air and water and attempting to grow nutritious food. Maintenance ensures that the daily work is done, Science works hard on a breakthrough that will save the planet, and BattleField, Earth's heroes, fight to defend Earth and its allies to ensure a brighter future.