- 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 [Cyclops [Scott Summers]; Marvel Girl [Jean Grey]; Angel [Warren Worthington III]; Iceman [Bobby Drake]; Beast [Hank McCoy]]; The Frankenstein Android (intro, death; not the Frankenstein Monster); Changeling
- 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) -
in X-Men: First Class Giant-Size Special (Marvel, 2008 series) #1 (December 2008) -
in The X-Men Omnibus (Marvel, 2009 series) #2 (2011)
Professor X secretly replaced by Changeling through issue #43.
- 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, Ken Jensen.