The Flash #213

This 1972 jumbo-sized special packs 52 pages of Flash action, and Neal Adams and Dick Giordano's cover makes an immediate case for why — the scarlet speedster stands front and center while, behind him, two versions of the Flash clash in a fierce battle, manipulated by a shadowy villain lurking in the background. The cover's teaser copy raises the stakes further by spotlighting four Justice Society heavyweights — Hawkman, Wonder Woman, Doctor Mid-Nite, and Green Lantern — promising their involvement in "Vengeance of the Immortal Villain!" With Gardner Fox scripting and Carmine Infantino on interior art, this double-Flash issue has serious pedigree to match its eye-catching premise.