Detective Comics #220

From the streets below to the rooftops above, this June 1955 issue of Detective Comics presents a genuinely puzzling scenario right on its cover: two Batman-and-Robin teams are simultaneously in action, with one duo on the ground wielding what appear to be ancient weapons — a shield and crossbow — while a second pair leaps dramatically overhead. Win Mortimer's cover art poses the question splashed across the issue itself: "The Mystery of the Second Batman and Robin Team!" With Bill Finger writing and Dick Sprang penciling the interior, this ten-cent thriller delivers the kind of imaginative dual-hero intrigue that made DC's 1955 lineup so much fun.