The Challenger is an inter-galactic traveller who seeks out various world’s mightiest warriors for the purpose of competing in battle. He does not seek to kill or conquer; he only wishes to engage in friendly competition for the sake of bragging rights. He claims to have been worshiped as a god on various worlds throughout his millenia long lifetime, and that he was known on Earth to the ancient Greeks and Romans as Ares and Mars, respectively, but chose to give up the warmongering persona when those pantheons were no longer worshipped. His place of origin is unknown and he is currently unknown on Earth, except only to Black Hole of the Cosmic Protectorate. He and she seem to have some kind of past knowledge of each other, though she has never mentioned him to her team mates and Challenger has not been on Earth since the last days of the Roman Empire.