Detective Comics #257

Detective Comics #257 brings Batman and Robin face-to-face with a truly baffling threat in "Batman's Invincible Foe" — and Curt Swan and Stan Kaye's cover captures the tension perfectly. Batman crouches atop the Batmobile while Robin swings in nearby, both reacting to a mysterious purple flying saucer piloted by a strange figure overhead, as Batman urgently warns his partner they don't stand a chance against this unknown menace. For a dime in 1958, this cover promises exactly the kind of imaginative, science-fiction-tinged adventure that made DC's Silver Age titles so irresistible.