Sirius is a habitable planet populated by small, big headed humanoids like all other planets found in in the galaxy such as ChiFang for example. It consists of futuristic cities filled with glass buildings and perfect gardens, it is the future utopia, until Notorious Mental takes control of the planet and uses it as his headquarters, becoming the leader. Under his leadership, Sirius is shielded by technology on the moon Kronor.
The planet was once populated by Sirians and governed by the Great Sirian council, but taken over by Mental and his minions. The majority of the planet is split up into mega cities, one of these being Siriusopolis, split into the uptown and downtown districts. Method of transportation are floaters, hovercars which drive over the numbered highways in Sirius.