- Script
- Roy Thomas (credited)
- Pencils
- Don Heck (credited)
- Inks
- George Tuska (credited)
- Colors
- ?
- Letters
- Artie Simek (credited)
- First Line of Dialogue or Text
- Factor Three has been defeated!!
- Genre
- superhero
- Characters
- X-Men
X-Men: Angel [Warren Worthington III]; Beast [Hank McCoy]; Cyclops [Scott Summers]; Iceman [Bobby Drake]; Marvel Girl [Jean Grey]
Changeling (impersonates Professor X); Frankenstein Monster (flashback); The Frankenstein Android (introduction, also in flashback, death; Dr. Powell (also in flashback); Charlie
- Universe
- Marvel : mainstream
- Reprints
- in Fantastic Annual (IPC, 1967 series) #1970
- in Strange (Editions Lug, 1970 series) #40 (5 avril 1973)
- in The X-Men (Marvel, 1963 series) #88 (June 1974)
- in The Titans Annual (World Distributors, 1976 series) #1977 (1976)
- in Spidey (Editions Lug, 1979 series) #56 (10 septembre 1984)
- in Marvel Special (Marvel Italia, 1994 series) #14 (Luglio 1998) [page count uncertain]
- in Marvel Masterworks: The X-Men (Marvel, 2003 series) #4 ([October] 2004)
- in Essential Classic X-Men (Marvel, 2006 series) #2 (2006) [black and white]
- in X-Men: First Class Giant-Size Special (Marvel, 2008 series) #1 (December 2008)
- in Marvel Masterworks: The X-Men (Marvel, 2009 series) #4 (2011)
- in The X-Men Omnibus (Marvel, 2009 series) #2 (2011)
- in X-Men Epic Collection (Marvel, 2014 series) #2 - Lonely Are the Hunted (2016)
Professor X secretly replaced by Changeling through issue #43.
- Script
- Stan Lee; ?
- Letters
- typeset
Stan's Soapbox, Items, The Mighty Marvel Checklist.
- Script
- Roy Thomas
- Pencils
- Don Heck (illustrations)
- Inks
- Vince Colletta (illustrations)
- Colors
- ?
- Letters
- typeset
- Characters
- Iceman; Cyclops; Beast; Angel
- Reprints
Letters from: Robert Thuotte, Doug Nikkel, Lewis Flock, Jon Ray, Connie Sheehand, Richard Struempler, and Ken Jensen.