| Issue | #50 |
| Published | November 1968 |
| Cover Price | 0.12 USD |
| Pages | 36 |
| Editing | Stan Lee |
| Notes | First use of the iconic block-lettered X-Men logo as created by Jim Steranko. |
| Characters | The X-Men [Angel; Beast; Cyclops; Iceman; Marvel Girl]; Polaris |
| Genre | superhero |
| Pencils | Jim Steranko |
| Inks | Jim Steranko |
| Colors | Jim Steranko ? |
| Letters | Jim Steranko (logo design) |
| Notes | Possible Steranko color credit by Nick Caputo. |
| Reprinted | in Marvel Special (Marvel Italia, 1994 series) #16 |
| Characters | The X-Men [Angel; Beast; Cyclops; Iceman; Marvel Girl]; Lorna Dane; Mesmero (Villain); Demi-Men (Villain); Magneto Robot (Villain; Introduction) |
| Genre | superhero |
| Script | Arnold Drake |
| Pencils | Jim Steranko |
| Inks | John Tartaglione |
| Letters | Herb Cooper |
| Reprinted | in Marvel Special (Marvel Italia, 1994 series) #16 |
| Characters | Beast (origin continued); Hank McCoy (as young child and teenager); Norton McCoy; Edna McCoy; Uncle Bob; El Conquistador (name revealed in next issue; Villain; Introduction); Chico (name revealed in next issue; Introduction) |
| Genre | Superhero |
| Script | Arnold Drake |
| Pencils | Werner Roth |
| Inks | John Verpoorten |
| Letters | Herb Cooper |
| Notes | The Origins of the Uncanny X-Men! part 13, origin of the Beast part 2, 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] |