Creator
Bill Mantlo, Ed Hannigan
  
Arnold Drake, Don heck
  
In Comics
The Spectacular Spider-Man #64 - Cloak and Dagger!
  
The X-Men #49 - Who Dares Defy The Demi-Men?
  
Base
Holy Ghost Church, 42nd Street, New York City
  
Serval Industries, Virginia; formerly X-Factor Investigations Headquarters, Starjammer; Xavier Institute for Higher Learning, Salem Center, Westchester County, New York; Genosha; X-Factor HQ, Washington D.C., Maryland; Mutant Research Center, Muir Island;