Wikipedia
Annihilus is a fictional supervillain 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 its 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 before becoming allies.
He would later lead an enormous fleet of space ships from the Negative Zone into the main universe, setting off the Annihilation Wave by destroying or subjugating many planets. The armada was opposed by a number of cosmic heroes such as Star-Lord, Drax the Destroyer, Silver Surfer, and was ultimately stopped by the cosmic entity Galactus, killing Annihilus in the process, but he was later reborn as an infant in the aftermath of the Annihilation storyline.
Annihilus has appeared in a number of Marvel media, including several Fantastic Four shows, The Super Hero Squad Show, The Avengers: Earth's Mightiest Heroes, Hulk and the Agents of S.M.A.S.H. and Ultimate Spider-Man. In 2009, Annihilus was ranked as IGN's 94th Greatest Comic Book Villain of All Time.