Nolan Grayson was an alien Viltrumite born on their planet Viltrum. At some point he came to Earth and became the hero known as Omni-Man. He later started a family with his wife, Deborah, and together they had a son, Mark Grayson, who would become the hero known as Invincible under Nolan's guidance.
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The super-being known to the people of Earth as Omni-Man is not actually human, but a member of the alien Viltrumite race. Extremely powerful by human standards, the Viltrumites are a brutal, vicious race. They achieved a what they term a utopia by culling the weaker from their own numbers, leaving a race of conquerors bent on bringing new worlds under their control, subjugating weaker civilizations. Races who failed to submit to the Viltrumites were attacked and in some cases wiped from existence.
Nolan had pursued greatness among the Viltrumites, working arduously to earn a position on the conquering committee. He was stationed on the frontier of the expanding empire, helping conquer numerous worlds, as well as undertaking solo missions such as hunting down the "infinity ray" weapon. Excelling at his work, Nolan received accolades for his brutality and efficiency and was soon promoted to lead his own division.
Omni-Man is a Viltrumite sent to Earth to conquer it, but started a family instead. He married a woman he saved and had a son, Mark Grayson, Invincible. Knowing that his wife and son would not accept him for who he really was and what his real reasons for coming to earth were, he changed his story from one of conquest to one of peace bringer.
Omni-Man, going by the name Nolan Grayson, became an author to make money and when he wasn't writing, he was protecting the planet as Omni-Man with the aid of a government official named Cecil. After he had learned his son Mark, had developed his super powers, he helped Mark understand how to use these new powers and the told him that he would get stronger but only by pushing himself physically. Omni-Man and Invincible at times also worked together.
Omni-Man knowing that he had strayed from his goals set in motion the plan of weakening earths defenses by killing former friends The Guardians of the Globe. Do to the work of GG's enemies, the member of Guardians of the Globe The Immortal was brought back to life with the intent of controlling him. He did not fall under there control though and proceeded to go after Omni-Man intent on revenge. Mark arrived to help his father with a rescue only to arrive just as he killed Immortal for the second time. Omni-Man proceeded to tell Mark the truth of his past and why he had been sent to Earth. Mark would not believe that his father was a cold blooded killer and confronted him instead, not willing to join in part of conquering or destroying earth.
They fought and Omni-Man beat his son nearly to death. Seemingly unable to kill his own son he left the planet, and started another family on another world. He contacted his son some time later and invited him to the planet where he was living. There he revealed that he had another son, for on this planet the beings that lived there grew much faster, so in the few months he was away he had had a child that was now a toddler. It was at this point that several other Viltrumites appeared and attempted to capture Omni-Man. Mark was forced to leave (taking his half brother back to Earth with him) and abandon his father who is currently a prisoner of the Viltrumites, his own people. The last thing Omni-Man said to his son was, "Read my books." When Mark was teaching his half brother how to fly, on Earth, he had to explain to him that everyone on Earth hated Omni-Man, but he didn't believe it.
While in Prison, Allen the Alien (who had gotten himself incarcerated) hatched an escape plan with Omni-man. On the day his execution was to be carried out Allen busted himself free and also freed the Battle beast along with Omni-Man they killed the two Viltrumite executioners.
Allen the Alien and Nolan have just escaped from the Viltrumite prison in which they were being held captive. Their primary focus is going to certain parts of the universe, and finding things that can hurt the Viltrumites. Nolan (having been on many adventures himself) knows what can hurt them. It is also noted that there was a virus produced by rebels of the Viltrumite empire which was successful in killing a large number of them and in turn leaving an extremely small population of Viltrumites alive. It seems the reason they need to inhabit earth is because they can successfully re-breed their population there.
Nolan's novels are are actually brought to life when Allen discovers that the Space Racer (a man Nolan supposedly killed) is still alive. He has a special type of weapon that returns to him automatically when touched by other individual. Nolan and Allen try to save him by digging him out of the rubble. Finally the Space Race is exposed and tries to kill Nolan. When Space Racer tries to kill Nolan, Nolan explains that he has switched sides. Space Racer doesn't believe him at first, but Allen then reassures him and he agrees to play a role in the upcoming war.
He then returns to Earth searching for his son and Tech Jacket. After finally founding them both, he decided to bring Oliver too this mission also. In the middle of the vastness of space they all get attack by Conquest.