Kayo Kirby was a champion boxer. He lost his title when he was drugged during a match, but motivated by his love for Mary Harden, he came back to win the title again, and to personally take down the crooks who drugged him. He went on to fight matches all over the world, travelling with his manager, Manny Gold. He also had many fights and adventures outside the ring. When he wasn't fighting, he studied law.