Nolan Grayson (Omni-Man) is unquestionably the strongest being on our planet; he is also our most spirited protector, having saved the planet from untold calamity. His son Mark, wants nothing more than to follow in his footsteps. But there's something sinister afoot and Omni-man may not be what he appears. Which may prove even too much for the Guardians of the Globe.

After an earth-shattering betrayal, Mark fights to rebuild his life. In the face of apocalyptic threats, he discovers new allies and wrestles with his greatest fear - that he might become his father.

Everything changes as Mark is forced to face his past and his future, while discovering how much further he'll need to go to protect the people he loves.