| Issue | #3 |
| Published | February 1980 |
| Cover Price | 0.40 |
| Pages | 36 |
| Editing | Danny Fingeroth |
| Genre | superhero |
| Pencils | Bob Budiansky |
| Inks | Mike Esposito |
| Characters | Intro: Vanisher; X-Men; Prof X |
| Genre | superhero |
| Script | Stan Lee, Jack Kirby |
| Pencils | Jack Kirby |
| Inks | Paul Reinman |
| Letters | Sam Rosen |
| Editing | Stan Lee |
| Reprinted | from X-Men (Marvel, 1963 series) #2 (November 1963) [pp. 1-11] |
| Characters | Into: Jack O'Diamonds; Prof X; Scott Summers |
| Genre | superhero |
| Script | Roy Thomas |
| Pencils | Werner Roth |
| Inks | John Verpoorten |
| Letters | Al Kurzrok |
| Editing | Stan Lee |
| Notes | origin of Cyclops part 2 |
| Reprinted | from X-Men (Marvel, 1963 series) #40 (January 1968) |
| Characters | Marvel Girl |
| Genre | superhero |
| Pencils | Jack Kirby |
| Inks | Chic Stone |
| Reprinted | from X-Men (Marvel, 1963 series) #9 |