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Invincible is an American comic book series written by Robert Kirkman, illustrated by Cory Walker and Ryan Ottley, and published by Image Comics. Set in the Image Universe, Invincible follows the coming of age of superhero Mark Grayson / Invincible, a half-Viltrumite and first-born son of Omni-Man, the most powerful superhero on Earth. The series began publication on January 22, 2003, before concluding on February 14, 2018, spanning 144 issues.