Captain Karl C. "Helo" Agathon is the former Commander, Air Group (CAG) of Home One. He is young, capable, and resourceful with an acute sense of right and wrong, something which he is prepared to articulate and act upon, even at risk to his own standing. After being stranded on Caprica after the attack he develops a relationship with a Number Eight copy later known as Athena. The two remain devoted to each other and have a child named Hera.
His closest friends among the crew is Kara Thrace, Wedge Antilles and Sera. Agathon is almost always addressed by his callsign.