

In a dramatic flashback-filled issue, Professor X reveals the secrets of his past to the X-Men—including the bitter rivalry with his stepbrother, Cain Marko. When Marko discovers the Crimson Gem of Cyttorak, he is transformed into the unstoppable Juggernaut. As the X-Men brace for their most formidable threat yet, readers witness the foundations of Charles Xavier’s mission and the eerie origin of one of Marvel’s most powerful villains. A cornerstone Silver Age key with deep lore and iconic art.
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