At the start of the comic, Nolan Grayson is portrayed as the strongest person on Earth and one of the strongest Viltrumites. Later on, we are introduced to Thragg, who is the ruler of the planet and a much stronger individual than Nolan. Although Mark is relatively weak at the start of the story, he eventually becomes the strongest Viltumite, with his power surpassing that of Omni-Man and Thragg.