Story by Stan Lee. Art by Jack Kirby, Alex Toth. Cover by Jack Kirby.
The uncanny origin of Professor X...and the unstoppable menace of the Juggernaut. Cain Marko is one of the X-Men's most formidable foes - and even, over the years, an occasional ally - but what is his connection to Charles Xavier? And what is the secret of his incredible power? The X-Mansion has some of the strongest fortifications and deadliest defenses around, but even they are barely slowing the Juggernaut down as he advances implacably towards his goal: revenge. As Professor X reveals his hidden past and his greatest shame, the teenage mutants known as the X-Men gird for battle...but can they find a way to stop the unstoppable? It's one of the all-time great Marvel comic books, boldly re-presented in its original form, ads and all. Reprinting X-MEN (1963) #12. Rated All Ages.