Mark Grayson, the main character, is a half-human, half-alien who gains super strength, speed, and near invulnerability.

Mark’s dad, Omni-Man, comes from an alien race called the Viltrumites. Because of this, Mark inherits amazing powers like superhuman strength, fast speed, and the ability to heal quickly. These powers make him one of the strongest heroes on Earth, but he must learn to use them responsibly while dealing with normal teenage life.