Mark Grayson, also known by his hero alias Invincible, is the titular character of Robert Kirkman's Invincible comic series and Amazon's animated adaptation.

The son of the Viltrumite superhero Omni-man and his wife, the human woman Debbie Grayson. After Mark gains his powers at 17 years old, he discovers the harsh realities of being a superhero while struggling to define himself. He is shown to have a berserker side when fighting the Flaxans and Machine Head's villains, revealed to be a Viltrumite trait.

He is voiced by Steven Yeun in the Invincible animated series. Since Mark's voice actor is Korean-American and his mother Debbie is voiced by Korean-Canadian actress Sandra Oh, Mark is portrayed as half-White (or rather half-Viltrumite, but Nolan looks white) half-Korean in the series.

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