Annihilus
Annihilus is a fictional character appearing in American comic books published by Marvel Comics, primarily as an adversary to the Fantastic Four. His first appearance was in Fantastic Four Annual #6, published in 1968. He was created by writer Stan Lee and writer/artist Jack Kirby. He was responsible for the attacks in the Annihilation comic book event.
Annihilus has at various times been the ruler of the Negative Zone, controlling it's inhabitants via his powerful Cosmic Control Rod. He first encountered the Fantastic Four after Reed Richards discovered how to travel to the Negative Zone from earth. Over the years he clashed with the Fantastic Four on many occasions, often with the FF foiling his plans to invade Earth. He is often the partner of Blastaar, who started out as a rival to Annihilus' rule of the Negative Zone but later became allies.
He would later lead an enormous fleet of space ships from the Negative Zone into the main universe, setting off the Annihilation Wave across the universe, destroying or subjugating many planets. The armada is opposed by a number of cosmic heroes such as Star-Lord, Drax the Destroyer, Silver Surfer and ultimately was stopped by the cosmic entity Galactus. Galactus killed Annihilus, but he was reborn as an infant in the aftermath of the Annihilation storyline.