Creator
Bill Sienkiewicz, Chris Claremont
Chris Claremont, Marc Silvestri
In Comics
New Mutants #25 (March, 1985)
The Uncanny X-Men #244 - Ladies' Night
Base
formerly Ruth Aldines mind, Utopia, San Francisco Bay, California; Westcliffe, Colorado; "No-Time"; Moira MacTaggarts Mutant Research Center, Muir Island, off the coast of Scotland; Haifa; Paris, France
Xavier Institute, Salem Center, Westchester County, New York