Mark Grayson is the son of Omni-Man, one of the greatest superheroes on Earth. When his powers manifest as a teenager, he decides to follow in his father's footsteps, taking the name Invincible and battling evil. His career seems off to a good start, as he meets extraterrestrial champions like Allen the Alien and teams up with heroes his own age, like Atom Eve. But when the truth about his father comes to the survaces, his understanding of the world will never be the same.