Cain Marko (Earth-1)

"By the power of the demon Cyttorak, I am the unstoppable Juggernaut!"

Injured at War
Cain Marko was a simple soldier in Iraq fighting for his country. He merely wished to do his job and return home to his family, but he knew he had to serve his country first. After a while he became pretty confident he would be home in no time, but all of that ended when he was caught in a roadside mine explosion. Cain was the only survivor, but he was badly injured and he thought for sure he was going to die before anyone, ally or enemy, found him.

Cyttorak
Cain laid in the remains of the van for nearly a day until he began hallucinating, but in reality, he was being transported into the Red Dimension. Cain heard the voice of a demon, and that demon was Cyttorak, Lord of the Red. He offered Cain survival in exchange for becoming the Juggernaut. Cain did not even consider the possibilities before he accepted Cyttorak's offer and he was transformed into the Juggernaut.

Rage of the Juggernaut
Cain was teleported back to his dimension, still burned, still injured. However, the Juggernaut's helmet was within arm's reach. Cyttorak's voice in his head was telling him to put it on. He did as he was told, and he was transformed into a hulk of a man. However, not only has appearance was altered, but his mind was as well. Cyttorak was now controlling him to take out both sides in the war, no matter what got in his way, and Cain was forced to obey.