Only at the age of 17 do Mark's powers finally reveal themselves and he takes up the mantle of Invincible. Though Nolan promises his son will one day manifest superhuman powers, Mark spends most of his childhood fearing he's just an ordinary human.

When Mark turns seven, his father reveals himself to be a Viltrumite - a member of an incredibly strong alien race who seek out new worlds and use their abilities to protect the innocent and uphold peace throughout the universe. Invincible #1 introduces Mark Grayson, the half-human son of an ordinary Earth woman named Deborah and an alien named Nolan, a man whom the world knows as the superhero Omni-Man. Invincible ultimately spanned 144 issues and assorted spinoff series before wrapping up in 2018.

While 2003's Invincible #1 is officially considered to be his first appearance, he technically debuted in 2002's Tech Jacket #1, which included a preview of Invincible #1. “ Invincible's OriginInvincible is a collaboration between writer Robert Kirkman (whom you may also know from an obscure little property called The Walking Dead) and artists Cory Walker and Ryan Ottley.

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