Real Name: Cain Marko
Powers:Invulnerability and Super strenght are a result of exposer to the "Crimson Gem of Cytorrak" (which has like, 10 different spellings, so don't get on my case). He also wears a Helmut which makes him impervios to psionics.
Significat Relatives: Charles Xavier, step brother.
After Xavier had lost the use of his legs and started his school, "Juggernaught" decided that would be a good a time as any to cause trouble. He handed the origional five X-Men thier asses, but they eventualy disposed of him. Throughout the years, Marko has menaced the X-men many times, mostly to get at his step brother, Charles. Juggs even went up against Spiderman (and others) on occasion. And they all learned that "Nothing stops the Juggernaught" He eventulay teamed up with Black Tom Cassidy (Older brother to Banshee) and the two caused tons of trouble all in the name of fun. The two fisrt beat on the X-Men just before the "Pheonix saga", and later caused trouble for the newley formed X-Force.
Okay, so that wasn't in perfect order, but you have to understand that whenever Juggernaught showed up, he'd do some damage and go away. Almost all his appearances (up until the past two years) have been completly interchangable with no deffining of his character. However, He's cooled down and smartened up lately. He helped in the battle against Onslaught by revealing his identity (And getting his butt kicked), And even tried to LEGALY get all the X-Mens money by being Xaviers step-brother. He was driven off by Maggott ("What're you, a bait and tackle salesman?") and his "killer slugs". All because he was trying to help out Black Tom (he made appearences in other comics, like Spiderman trying to get money). And just a little while ago, he himself was in it bad, and Storm, Shadowcat, and Gambit lended a hand to make sure Juggs wouldn't die. Um, and that's about it...