"invade Earth" . . "space invaders" . . "alien forces" . "conquer Earth" . . . . "aliens can repopulate the Earth" . . "invaded by aliens" . "a worldwide invasion of space aliens" . . . "aliens invade the city" . . . "extraterrestrial invasion" . "Alien Attack" . . "had decimated Earth" . . "extraterrestrial attack" . . "invasion of aliens from outer space" . "alien invasions" . "alien invasion" . . "invasion force" . . "invasion of aliens" . "invasion of Earth" . "alien invasion of Earth" . . "Martian invasion" . . "Alien invasion" . "Invader Forces" . "invading aliens" . "Alien_invasion" . . "invader" . "Alien Invasion" . . "alien invaders" . . "Alien infiltration" . "invade" . "invading armies of evil aliens" . "full-scale invasion" . "under control of the aliens" . "heavy attack" . "alien incursions" . . . "alien infiltration" . "aliens" . "planning to conquer the Earth" . "invaded Earth" . "conquered and occupied" . "alien incursion" . "invasion" . "Alien invasion" . "invading alien race" .