Oliver Grayson’s Kid Omni-Man persona explained After Nolan was taken by the Viltrumites, Oliver was left in the care of his half-brother, Mark Grayson (Invincible), and stepmother, Deborah Grayson.

Fans are curious to know whether Oliver Grayson, aka Kid Omni-Man, is stronger than his brother, Mark, aka Invincible. The heroic half-brothers will unite in this third chapter to fight battles ...