During the combat missions, the player enters various parts of Earth and cleans out alien infestations either on foot or in a vehicle.

It's an alien infestation that doesn't show up on the surface until it's too late.

The result of the devastation: reconstruction and a better city Such was the case with the alien infestation.

They soon find out that the colonists have all been killed by the alien infestation.

The alien infestation is unable to reshape those organs without killing its host.

It is a horizontally-scrolling shooter with the player piloting a space ship in order to stop an alien infestation of the Moon.

The varieties of alien infestation are limitless and strange, but one weapon has saved the world more often than any other, fire.

But their return to the solar system made them refugees once more, fleeing Earth and its alien infestation in a desperate attempt to stay alive.

The rumbling is suggested to be either the insects returning or Army tanks finally arriving to attack the alien infestation.

Using the last ounce of his strength, he piloted the orbital platform into the sun in order to kill the alien infestation on board.