The Cybock Imperium was a group that was considered a threat to the universe.
After defeating the Hyperion, Rassilon and the Alliance of Races embarked on another campaign against threats to universal harmony. One such enemy was Count D'if of the Cybock Imperium. Rassilon challenged D'if to a game of Rassilon's roulette using the Time-Gun of Rassilon. D'if lost and he was wiped from existence. (COMIC: Gangland)