| Issue | #49 |
| Published | October 1968 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Characters | X-Men [Cyclops; Angel; Beast; Iceman; Marvel Girl] |
| Genre | superhero |
| Pencils | Jim Steranko (signed) |
| Inks | Jim Steranko (signed) |
| Letters | typeset |
| Reprinted | in Marvel Special (Marvel Italia, 1994 series) #14 |
| Characters | Lorna Dane (Introduction); Mesmero (Villain; Introduction); Demi-Men (Villain; Introduction) |
| Genre | superhero |
| Script | Arnold Drake |
| Pencils | Don Heck; Werner Roth |
| Inks | John Tartaglione |
| Letters | Herb Cooper |
| Notes | X-Men rejoined as a team |
| Reprinted | in Marvel Special (Marvel Italia, 1994 series) #16 |
| Characters | The Beast (Origin beginning); Hank McCoy (as baby); Norton McCoy (Beast's father); Edna Andrews McCoy (Beast's mother); Bob (Norton McCoy's uncle)(introduction); Paul Martin (introduction) |
| Genre | Superhero |
| Script | Arnold Drake |
| Pencils | Werner Roth |
| Inks | John Verpoorten |
| Letters | Irving Watanabe |
| Notes | The Origins of the Uncanny X-Men! part 12, origin of the Beast part 1, page 1 of this story is not reprinted in the Amazing Adventures #17 and X-Men: Mutations #nn reprints. |
| Reprinted | in Marvel Masterworks: The X-Men (Marvel, 2003 series) #5; in Essential Classic X-Men (Marvel, 2006 series) #2 [black & white]; in Amazing Adventures (Marvel, 1970 series) #17 (March 1973) [pages 2-5]; in X-Men: Mutations (Marvel, 1996 series) #nn (1996) [pages 2-5]; in Marvel Special (Marvel Italia, 1994 series) #12 (Novembre 1997) [abridged] |