The deaths of the Newtons leave their son, Curtis, to be raised by the unlikely trio of Otho, Grag, and Simon Wright. Under their tutelage, Curtis grows up to be a brilliant scientist and as strong and fast as any champion athlete. He also grows up with a strong sense of responsibility and hopes to use his scientific skills to help people. With that goal in his mind, he calls himself "Captain Future"; Simon, Otho and Grag are referred to as the "Futuremen" in subsequent stories. Other recurring characters in the series are the old space marshal Ezra Gurney, the beautiful Planet Patrol agent Joan Randall (who provides a love interest for Curtis), and James Carthew, President of the Solar System whose office is in New York City and who calls upon Future in extreme need.