Attention, Commander! At approximately 0400 hours we received confirmation that a fleet of unidentified vessels are heading toward this nuclear facility. There can be no doubt, these are the extra-terrestrial invaders that sat-com has been warning us about. We are Earth's last hope of knocking these guys out of the sky, and they know it too. They're going to fight tooth and nail to bring us down, so we're counting on you to defend this facility as if the world depended on it. Scratch that -- it *does* depend on it, Commander! Move out!