Mark Grayson is a normal high school freshman whose father, Nolan Grayson, is an extraterrestrial of the planet Viltrum known as Omni-Man, the most powerful superhero on the planet. At age seventeen, Mark begins to display super powers as a result of his Viltrumite ancestry, and adopts the superhero name Invincible with his father acting as his mentor. Early in his hero career Mark meets heroine Atom Eve, and they eventually enter a relationship.
