According to the Sailor Moon R series, a second Silver Millennium will appear on Earth some time between the 20th and 30th centuries, this time centered in Crystal Tokyo. The royal family of the Moon Kingdom during the Silver Millennium bear on their foreheads special markings shaped like small crescent moons. These appear on Queen Serenity, Princess/Neo-Queen Serenity, and Chibiusa Small Lady, as well as Sailor Venus when disguised as the princess and the moon cats - Luna, Artemis and Diana. In the anime, non-royal civilians of the Moon Kingdom lack the symbol on their foreheads.