In the 1960s, superpowered humans Charles Xavier and Erik Lensherr work together to find others like them, but Erik's vengeful pursuit of an ambitious mutant who ruined his life causes a schism to divide them.
The early years of James Logan, featuring his rivalry with his brother Victor Creed, his service in the special forces team Weapon X, and his experimentation into the metal-lined mutant Wolverine.
In a world where mutants (evolved super-powered humans) exist and are discriminated against, two groups form for an inevitable clash: the supremacist Brotherhood, and the pacifist X-Men.