| Characters |
The X-Men [Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Beast (Origin); Iceman]; Sentinels; Master Mold; Dr. Bolivar Trask; Edna McCoy; Norton McCoy |
| Synopsis |
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. |
| Genre |
superhero |
| Script |
Stan Lee |
| Pencils |
Jack Kirby layouts; Werner Roth (as Jay Gavin) pencils |
| Inks |
Dick Ayers |
| Letters |
Artie Simek |
| Notes |
Story continued in X-Men 16 |
| Reprinted |
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 |