Cal Durham is an ex-mercenary with the ability to breathe underwater who acts as a member of the Aquaman Family. Originally he worked as Black Manta's henchman for political reasons, but he would realize the error of his ways and go on to become a hero. He would go on to become the Mayor of Sub Diego in Sword of Atlantis. The character Kaldur'ahm, who becomes the second Aqualad, is also based on his name. Cal Durham was created by David Michelinie and Jim Aparo, first appearing in Aquaman #57. (1977)