'The Fantastic Four' has cast its big bad! Marvel has cast Ralph Ineson as the main villain in its upcoming 'Fantastic Four' reboot. The British actor, whose work spans 3 decades from the 'Harry Potter' movies to the recent horror prequel 'The First Omen,' has landed the plum part of Marvel antagonist, Galactus, an intergalactic being who eats the life force of planets. And now he just picked the wrong planet to nosh on.