Creator
Chris Claremont, Paul Smith
David Michelinie, John Byrne
Base
The Xavier Institute, Salem Center, Westchester County, New York State, (former) The Alley (beneath Manhattans surface), X-Factor Is sentient starship
Avengers Compound, Los Angeles; formerly Infinite Avengers Mansion; Captive aboard a Skrull ship; Avengers Mansion, New York City, New York