Kelly Robinson is a professional tennis player to the world, but he is actually an American secret agent traveling under cover, protecting the interests of the U.S.A., using his tennis bum identity as an excuse to travel the globe covertly.He is accompanied by his capable partner Alexander(Scotty) Scott , a strait-laced Rhodes scholar fluent in many languages, who travels posing as Robinson's manager, trainer and coach. Scotty was really the brains of the team. Kelly was the athlete and playboy who lived by his wits.