Johnny Fox is a private detective nicknamed “the Indian Ace.” Fox’s dying grandfather, a medicine man, bequeaths to him the secret of his recently developed sun-shot pellets, which have the power to turn a person invisible. “With the aid of powerful sun-shot pellets, Johnny Fox—Seminole Indian brave—can become invisible at will.” He is also an excellent archer. Fox is a sharp dresser. He does not wear a uniform, but in his early adventures would often do battle with his enemies shirtless, in conventional trousers, carrying a bow. A college educated young man in “superb physical condition,” Fox uses his wits and his power of invisibility to help deserving individuals in need in Florida. When he loses the formula for these pellets in Champion 9, Fox decides to move to New York City and become a private detective. Then, in Champ 12, the ghost of his grandfather communicates the lost formula to Johnny through the psychic abilities of Mama Three Bears. Fox takes on Axis saboteurs in later stories.