Cain Marko

Cain Marko, better known as Juggernaut, is a long time enemy and sometimes ally of the X-Men. As a child, Cain was regularly abused by his alcoholic father. His stepbrother, Charles Xavier, on the other hand was treated much better while also exceeding him in studies and sports. All of it caused Cain to hate Xavier for years. While serving in the US army, Cain accidently found the Temple of Cyttorak and obtained the Crimson Gem. The Gem's mystical power transformed Marko into Cyttorak's avatar on Earth — the Juggernaut. Marko used his powers to spread chaos and cause destruction often together with his partner-in-crime Black Tom Cassidy.

After years of being a villain and terrorist, Marko started to reform. He reconciled with Xavier, joined the X-Men and later the Excalibur.

When Asgardian God of Fear descended on Earth, Cain was possessed by one of its servants, Kuurth Breaker of Stone, for a short time. Eventually, Marko became Cyttorak's avatar once again and gained even greater strength. His powers include limitless strength, limitless stamina, regeneration, invulnerability, and immortality. Cain was susceptible to exceedingly high levels of mental and mystical attack. For example, Mjolnir once was able to absorb and negate Cain's formerly impenetrable magic force field. Both types of attacks were able to harm him, but neither were shown to cause any type of permanent injury. His weakness to mental attacks was typically nullified by his helmet, but after his latest upgrade, he is now completely immune to psychic assault even without his helmet. If Juggernaut does not use his powers in a manner approved of by Cyttorak, the power of the gem does not work correctly, essentially making him a human with only a portion of some of his powers. Still wears his helmet to conceal his identity, and is very American. Despite his masculine demeanor, he is bisexual and surprisingly open minded.