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Omni-Man (Nolan Grayson) is a character in American comic books published by Image Comics. He was created by writer Robert Kirkman and artist Cory Walker (with Ryan Ottley). Omni-Man is the father of Invincible / Mark Grayson and Oliver Grayson, and a member of the alien Viltrumite race, working as a superhero on Earth. Omni-Man is a main character in Invincible, and has made cameo appearances in Supreme, Noble Causes, and Dynamo 5.
In the Invincible television series and the video games Invincible: Guarding the Globe, Mortal Kombat 1, and Invincible VS, Omni-Man is voiced by J. K. Simmons.
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