World's Finest Comics #249

In "Will the Costume Make the Hero?", Green Arrow is forced to don a Batman-inspired costume and play the role of the Dark Knight when an old foe mistakes him for the caped crusader. With Black Canary and Lieutenant Mack Morgan at his side, he must track down the elusive Blitzschwalbe, who’s been captured by the cunning Hellgrammite—posing as a hero, but testing the limits of identity and deception.