Earth and Moon move from their home in the suburbs to an urban community. There they buy an apartment in a place called the Milky Way Aparment Complex. Already living in the building are personified planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune. Pluto continuously tries to set up residence on the front lawn, but the security always throws him out. The owner of the building is a fiery woman named Sun. Earth and Moon continue to share adventures with their new neighbors.