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Official Site: Image Comics

Invincible (Mark Grayson) is a superhero in the . Created by writer Robert Kirkman and artist Cory Walker, the character first appeared in Tech Jacket #1 (October 2002), before graduating to his own self-titled regular series in 2003, as the premier title in Image's then-new superhero line.

Invincible is the teenaged son of Omni-Man, an extraterrestrial superhero of the Viltrumite race. Invincible inherited his father’s superhuman strength and ability to fly and he has sworn to protect the Earth. He has had trouble adjusting to his newfound powers and coping with the reality of his origins.

While Robert Kirkman has been the sole writer of the series, Cory Walker and Ryan Ottley have contributed the art. Cory Walker co-created the book and provided art from #1 to #7. Ryan Ottley assumed art duties with issue #8 and has been pencilling since. Kirkman has provided back-up space for a few aspiring comic creators, most notably Benito Cereno and Nate Bellegarde.

Mark Sebastian Grayson is the son of Nolan Grayson (Omni-Man) and Deborah Grayson. When Mark was seven years old, Nolan reveals that he is a Viltrumite, a race of peaceful explorers, and had come to Earth to help mankind and that one day Mark would develop super powers. Mark's powers eventually appear while he is working at his part time job. Nolan takes Mark to his superhero tailor.

Grand Regent Thragg has not been a contender in any CBUB matches.