The Aliens are leading a conquest of the planet Earth, and it is up to the secretive Earth Defense Unit to stop them! Build the Earth Defense HQ to help the ADU in all their covert operations against the Alien menace! Being a mobile operating base, the Earth Defense HQ is capable of all manner of tactical actions like unhooking the science bay to help the front end of the HQ speed into action and even launching an aerial vehicle from the top of the science bay! Confront the UFO causing trouble and defend the Earth! Perfect for fans of the Alien Conquest theme or for any science fiction fans! Comes as-is. Includes instruction booklets.