Uncanny X-Men Vol.1 #12


 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.

Printed: Jul 1965
Writers: Stan Lee
Art: Jack Kirby, Alex Toth, and Vince Colletta
Cover: Jack Kirby and Frank Giacoia

Key Issue Details
- 1st appearance and origin of the Juggernaut
- Origin of Professor X
- 1st cameo appearance of Cyttorak (as a statue), the demonic elder god whose Crimson Bands and ruby gemstone gave Juggernaut great powers