Outside Context Problem

When a UFO crashes near a top secret military base, the American Government realises that aliens have been spying on the human race for years. But even as they rush to unlock the technological secrets in the alien craft, the aliens launched the first step in their plan to invade the Earth and enslave the human race. With a giant mothership approaching the planet and the inhabitants promising peace and plenty, humanity must defeat a vastly superior foe with uncertain motives or lose its free...