| Issue | #12 |
| Published | October 1996 |
| Cover Price | 0.99 USD |
| Pages | 36 |
| Editing | Kelly Corvese; Matt Idelson (assistant) |
| Characters | Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast; Juggernaut |
| Genre | superhero |
| Pencils | Duncan Rouleau |
| Inks | Ian Akin ? |
| Letters | Typeset |
| Characters | X-Men--Professor X; Cyclops; Marvel Girl [Jean Grey]; Angel; Iceman; Beast; GUESTS: Sharon Xavier (flashback); Kurt Marko (flashback); VILLAIN: Juggernaut |
| Synopsis | Xavier tells the X-Men the origin story of his step-brother, Cain Marko--the unstoppable Juggernaut. |
| Genre | superhero |
| Script | Jorge Gonzalez |
| Pencils | Duncan Rouleau |
| Inks | Harry Candelario; Ian Akin |
| Colors | Brad Vancata |
| Letters | Phil Felix |
| Notes | Based loosely on X-Men (Marvel, 1963 series) #12 |