After the US army shot down a UFO in Roswell in 1947, generations of elite commandos were secretly trained to combat a return from alien enemy forces. After almost seventy years of no attack, the sudden alert of an imminent invasion sends shudders around earth and the unit are brought to the front line. As a ferocious attack reigns down from outer space, the soldiers quickly realise that the only way to avoid extermination is to recover a secret weapon captured at the original Roswell crash. A race against time ensues as the elite force battle to keep the aliens at bay whilst tracking down the only weapon which can save the human race…