Galactus

Galactus (real name: Galan) is a godlike supervillain from the Marvel universe, who, although not exactly malevolent, is nevertheless a dangerous individual who requires nothing short of entire worlds to hold off his eternal hunger and is also linked in such a way to the Marvel universe, that if he dies, the entire Marvel universe will end. This makes Galactus somewhat unique in the fact he is both an immensely destructive force yet also necessary for the existence of the universe. He is considered to be the arch-enemy (and sometimes as ally) of the Silver Surfer being his main antagonist and the Fantastic Four serving as one of the main antagonists alongside Doctor Doom. He is also the main antagonist in the ultimates crossover Cataclysm: The Ultimates' Last Stand and the coming of Galactus trilogy,and Ulitmate Alliance 2.