"The Origin of Professor X"
So starts the tale of Charles and his step-brother Cain, aka the Juggernaut. Charles tells the story of Cain and their rivalry as children as Cain stands outside of the School, tuanting the X-Men. No matter what they throw at the Juggernaut, it's not enough to stop him as he finally reaches Xavier.
First appearance of the Juggernaut. Origins of Professor X and Juggernaut.