The X-men #121
| Series | The X-men |
| Number | Vol. 1 #121 |
| Publisher | Marvel Comics |
| Date | 1979 |
| Type | Comic Book, Softcover |
| Language | English |
| Inker | Terry Austin |
| Penciler | John Byrne |
| Writer | Chris Claremont |
| Genre | Superhero |
| Published in | United States |
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