Base
Xavier Institute for Higher Learning, Salem-Center, Westchester County, New York (ehemaligen) Muir Island, Schottland; Braddock Leuchtturm
X-Factor Untersuchungen Hauptquartier, New York City, New York; früher Detroit, Michigan; Mobile; Xaviers Schule für Gifted Youngsters, Salem-Center, Westchester County, New York; Mojoverse; Cootermans Creek, Australian Outback, Australia; Alcatraz I