Dr Linus Leofrix was a scientist.
He was being pursued by the police forces of the Federation of Civilised Worlds for his criminally unethical research. Leofrix and Rostow went to the Ogron planet so the doctor could use them for his mental augmentation experiments. He wanted to create an army of super soldiers to conquer the galaxy.
Unfortunately, his experiment worked too well. The first test subject, Gnork, became smarter than Leofrix and stole their spacecraft. He and Rostow were presumably killed by the Ogrons after this. (COMIC: Warlord of the Ogrons)