Chris Claremont, Paul Smith
Chris Claremont, Herb Trimpe
De Xavier Institute, Salem Center, Westchester County, New York State, (voormalige) The Alley (onder Manhattans oppervlak), X-Factor Is voelende starship
Xavier Institute, Salem Center, Westchester County, New York voorheen Braddock Manor, Verenigd Koninkrijk; Australische outback