Reed Richards, also known as The Maker, is the main antagonist of Ultimate Marvel.
Unlike most of his counterparts from different universes, this version of Mr. Fantastic is an idealist who makes a deal with an alien empire to attack and conquer the Earth in order to improve what he sees as a flawed species.
He has his entire family killed (including his baby siblings) so that he can fake his death and avoid suspicion. He later leads an advanced society of superhumans called the Children of Tomorrow. Under his rule, the Children of Tomorrow absorb entire cities into their base, wipe out most of the Asgardian gods, and completely destroy Washington. Throughout all this, Reed is fully aware of what he is doing, and feels no remorse for exterminating a species that he perceives as inferior.