Mark Grayson, also known by his hero alias Invincible, is the titular character of the Invincible comic and cartoon series. 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 voiced by Korean-American actor Steven Yeun and his mother Debbie is voiced by Korean-Canadian actress Sandra Oh, Mark is portrayed as half-White, half-Korean in the series.
