When a circus owner, Mr. Haly, is confronted by gangsters working a protection racket, he refuses to pay. His star attraction, the Flying Graysons are killed the following night in an "accident" with the trapeze. The Grayson’s young son, Dick, has overheard the gangsters and plans to go to the police, but Batman, who attended the show as Bruce Wayne, takes the boy instead. Batman trains Dick in the art of crimefighting. Dick already possesses acrobatic skill and ability. When he is ready, Dick dons a red and green costume and appears as Batman’s sidekick, Robin the Boy Wonder.