Uncanny X-Men #15
December 1965 | Standard
Key Facts
1st appearance of Master Mold
Origin of Beast
2nd appearance of the Sentinels
Key Facts
1st appearance of Master Mold
Origin of Beast
2nd appearance of the Sentinels
Issue Details
| Publisher | Marvel |
| Artist | Jack Kirby |
| Writer | Stan Lee |
| Published | December 1965 |
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