The Earth is a distant memory, abandoned by humanity during a time of ecological catastrophe millennia ago. Humankind’s descendants found a new home on a world they named Nova Prime. There they thrived and grew, until the arrival of an aggressive alien species humans dubbed the Skrel, who attacked the survivors relentlessly for years. But humankind fought back with unfailing determination, led by the valiant United Ranger Corps, and resisted the Skrel’s best attempts to wipe them out. The war persisted off and on over centuries, and then the Skrel genetically engineered a weapon of mass destruction—one that would test Ranger determination and resourcefulness like no other.