Several years before the series timeline, the Planetary Gears have traveled along the space, seeking planets with Orgone Energy to strip them of that energy for their personal growth, being described as "Space Vampires". During their travels they stumbled upon the Solar System and saw the potential for a new life-form to appear and evolve for their needs, where it is presumed they went to sleep waiting their chance, creating a living weapon known as Hana Muto for their purpose leaving her on Earth, while their mother-ship, Oberon was stationed in Uranus.