||The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast (Origin); Iceman]; Sentinels; Master Mold; Dr. Bolivar Trask; Edna McCoy; Norton McCoy
||The X-Men invade the Sentinel's underground complex but are captured; Beast is taken before the Sentinel's leader, Master Mold, and has his mind probed; Master Mold commands Trask to make an army of Sentinels so they can take over the world.
||Jack Kirby layouts; Werner Roth (as Jay Gavin) pencils
||Story continued in X-Men 16
||in X-Men (Marvel, 1963 series) #68; in Marvel Masterworks (Marvel, 1987 series) #7; in X-Men: The Early Years (Marvel, 1994 series) #15; in Marvel Special (Marvel Italia, 1994 series) #6