Fan Casting Erik Lehnsherr in X-Men: First Class

Erik is a survivor of the holohaust and a mutant with the powers to control metallic objects. He's a lifelong friend of Charles Xavier and help him run his school. Erik is the one who convinces Charles to let his students out on a mission to stop Mystique, and he leads the mission, Until the climax where it's revealed that Erik has malicious intentions of his own and instead helps Mystique to kill Trask and thus betrays Charles and his students.