[1] Robert Kirkman introduced Omni-Man as the father of the titular character in his comic series Invincible (January 2003–February 2018), redesigned by Cory Walker and Ryan Ottley as a black-haired, mustachioed man compared to his Supreme design of blonde hair and a clean-shaven face.

[5] In Invincible, Omni-Man arrived on Earth in the 1980s, where he eventually adopted the secret identity of a best-selling author named Nolan Grayson.

In issue number 7, Nolan lures Earth's premiere superhero team, the Guardians of the Globe, to their hideout in Utah, where he brutally murders all the members.

Remembering Omni-Man's betrayal, Immortal tracked down Nolan and battled him in public, outing him as the murderer and villain he truly is before being killed yet again.

The custom of the native inhabitants, a race of Mantis-like aliens, dubbed the Thraxans (an insectoid people who live entirely within a nine-month span), was to simply choose the oldest among them to act as their leader.

[9] He is later saved on the day of his execution by Allen the Alien, to whom he agrees to reveal the "secret": Viltrumites are a near-extinct race, with fewer than fifty pure-blood able individuals left.

[10] Embarking on adventures across the galaxy, they gather weapons and allies which will give them an advantage over the Viltrumites, before returning to Earth to collect Mark and Oliver.

They are briefly waylaid by the Viltrumite champion Conquest, an old enemy of Invincible who is killed in the ensuing battle, but not before Mark is critically injured.

Tensions mount when Thragg discovers that Nolan is a descendant of the long-dead Viltrumite king, and thus heir to the throne, provoking a fierce battle between them.

He has superhuman strength, able to easily lift immense amounts of weight, tear through virtually any matter and only continues to gradually grow stronger the more he struggles and ages.

He has nigh-limitless stamina, able to continue his exertions for long periods of time with no effect to his performance and endure any damage he does sustain unhindered.

While still needing air, Omni-Man can endure weeks holding his breath and likewise can survive the vacuum of space unprotected, allowing for unaided interstellar travel.

[24] The character has been compared to Superman,[25][26][27] Vegeta from the Dragon Ball franchise,[27][28][29][30] and Homelander from The Boys comic series and its TV adaptation.