Superman #244

Superman #244 brings a genuinely unnerving premise to life on Curt Swan and Murphy Anderson's striking cover: the Man of Steel writhes in agony, engulfed in crackling energy from an invisible attacker, while two alarmed bystanders — a young woman and a man with a camera — look on in disbelief, unable to see what's hurting him. "The Electronic Ghost of Metropolis!" promises a threat that Superman can't simply punch his way through, and at 48 pages for just 25¢, this 1971 issue also tosses in a "Superman of 2465" tale and a Captain Comet classic for good measure.