Little David Gardner's (Hunter Carson) starry-eyed dreams turn into an out-of-this-world nightmare when invaders from the red planet land in his backyard and unleash their evil plan on unsuspecting earthlings. Terrified as the aliens take over the minds of his parents (Laraine Newman and Timothy Bottoms) and even his schoolmates, David must find a way to stop them before they turn the whole human race into brain-dead zombies!