In distant future, humanity is recovering from a bloody civil war. Pilots CAMERON DAVIS and GEORGE LOCKLEAR, reservists with Sector Patrol, prepare for a long weekend off. That vacation is permanently cancelled when two alien armadas—the BOXTI and NANGOLANI—arrive near Earth. Though humanity wins the battle, the war quickly turns one-sided. One of Earth's colonies is rendered uninhabitable. George dies saving his friend, and Cameron is sucked through a wormhole and disappears.
Far away on the moon Kronos, JOSH RANTZ competes in a huge Army competition. Despite most of his unit falling to the enemy, Josh and his squad continue to win larger and larger victories. They are oblivious to the goings on of the universe, isolated on purpose by the war-game's designer, Doctor MARKOV.
When the exercise ends, Josh notices a meteor striking down nearby. He finds an injured Cameron, somehow transported across the stars to the military base. Moments later, the BOXTI arrive and invade. Outnumbered and outgunned, Josh and the soldiers on Kronos rally and push back the BOXTI horde. Summoned by their masters, the BOXTI leave the stunned humans behind.