The Viltrumites in Invincibleare incredibly strong, but Mark Grayson's father, Omni-Man, far exceeds his fellow warriors in strength. While Invincible himself is no slouch, Nolan Grayson is one of ...

This guide extensively talks about the inception and background of the Viltrum Empire in the Invincible comics and animated ...

Omni-Man, also known as Nolan Grayson, is a character created by Robert Kirkman for his Image Comics series Invincible. Father to the superhero Invincible, Mark Grayson, Nolan is shown to be a ...