| Issue | #12 |
| Published | April 1995 |
| Cover Price | 1.50 |
| Pages | 36 |
| Editing | Suzanne Gaffney (reprint); Stan Lee (original) |
| Notes | Statement of Ownership average # of copies in preceding 12 months: 97,083. |
| Characters | Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast |
| Genre | superhero |
| Pencils | Adam Hughes |
| Inks | Adam Hughes |
| Letters | Typeset |
| Notes | Statement of Ownership average # of copies in preceding 12 months: 97,083. |
| Characters | FEATURE: X-Men--Professor X (Origin); Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast; GUESTS: Sharon Xavier (flashback); Kurt Marko (flashback); VILLAIN: Juggernaut (Origin) |
| Synopsis | Cerebro detects a powerful mutant and Xavier fears that he knows who it is; The X-Men prepare the mansion for an all out assault; As the mysterious villain batters his way through the mansion's defenses, Professor X tells his students his origin story and how his step-brother changed from tormenting bully to an unstoppable Juggernaut. |
| Genre | superhero |
| Script | Stan Lee |
| Pencils | Jack Kirby (layouts); Alex Toth |
| Inks | Vince Colletta |
| Colors | Evelyn Stein |
| Letters | Sam Rosen |
| Reprinted | from X-Men (Marvel, 1963 series) #12 (July 1965) |
| Characters | Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast; Juggernaut |
| Genre | superhero |
| Pencils | Jack Kirby |
| Inks | Frank Giacoia |
| Colors | Evelyn Stein |
| Letters | Typeset |
| Reprinted | from X-Men (Marvel, 1963 series) #12 (July 1965) |
| Characters | Juggernaut |
| Genre | superhero |
| Pencils | Ken Lashley |
| Inks | Tom Wegrzyn |
| Letters | Typeset |
| Notes | Full page cover art for next issue. |