Xavier and Lensherr are two Mutants with different views about relationship of Mutants and humans. Xavier always wants to develop the super ability of Mutants to protect human while Lensherr has a deep feud with Dr. Klaus Schmidt a.k.a Sebastian Shaw, who killed his mom and use her body for experiments. When discovering Shaw is intending to start World War III, Xavier and Lensherr help the US government to prevent his plan.