Detective Comics (1937)
Published
Detective Comics #38, DC, April 1940
The first appearance and origin of Robin, and the cover sells him like a circus act: "The sensational character find of 1940" bursts through a paper hoop while Batman stands back to present him. Bob Kane and Jerry Robinson are credited with the cover. Set it beside Batman's shadowy rooftop covers of 1939 and the change of tone is right there on the newsstand.
More about Detective Comics