From the introduction: Welcome to Invincible. Set in the Image comic book multiverse, this setting is home to older heroes and villains like Spawn, The Darkness, and The Witchblade. This story, however, focuses on the new superhero Invincible (Mark Grayson), the half-breed Viltrumite-Human hybrid and son of the world famous hero Omni-Man (Nolan Grayson). Invincible spends the beginning of his career working alongside the Teen Team, and with his father, to defend not only Baltimore but the Earth from many and varied threats.