In a future where mankind has colonized the Solar System, there are various settlements, outposts, and colonies protected by the Planet Defense Corps. When the flagship Europa-1 is attacked by an unknown extraterrestrial aggressor, the Planet Defense Corps deploys Zero Tolerance, an elite squad of commandos. The attack caused extensive damage, resulting in many deaths and a core breach that will destroy the ship. Zero Tolerance is tasked with eliminating the alien threat and infected humans before the ship explodes, erasing all evidence of the attack. Their mission is crucial to protecting the Solar System from further harm.
