Alexander Helios was one of the children of Mark Antony and Cleopatra in the Alternate Rome universe created by Iam. He ruled the Dominion with his siblings. He planned to assassinate his brother Ptolemy Caesar so he could use "Ultimus" (an atomic bomb) to destroy Alexandria, and Cleopatra Selene along with it.
The plan failed, and on the day of the Games, he was goaded into the arena by Ptolemy. They faced a pack of wolves, and the one who the wolves ignored would be ruler of the Dominion. Thanks to some pheromones from the TARDIS that Ptolemy applied to himself, the wolves attacked Alexander. (PROSE: State of Change)