You know him as Professor Xavier. Pfft. What kinda dork calls himself "Professor"? Look at me, I'm gonna make my own school so you all hafta call me Professor! What a crock.
Anyway, Charles and his prissy mutant freakshow have always shut me down. Don't matter what I did or who I joined up with. I can punch a mountain to gravel, but I can't kill a cripple.
You wanna know why I'm joining you? Simple: I like winning. And I've been losing for too damn long. Screw Charles, screw the X-Men. I'm done wasting my time trying to kill them.
If that's not a good enough reason for S.H.I.E.L.D., they can all line up to kiss my big unstoppable ass. You've got the Juggernaut, whether you want me or not.