Action Comics #276 (1961)

Clark Kent and Lois Lane are called to the estate of John Kiley, a rich and charitable man who is now on his deathbed. He summons Clark in private and reveals that he has been a huge Superman fan for years. He reveals a secret room full of Superman memorabilia devoted to his hero. Kiley admits that his time is very limited and he explains that it has long been his goal to find out Superman's true identity. He had hired detectives in the past to investigate but his results were inconclusive. He does however state that his investigative efforts pointed to one man, Clark Kent. He then asks Clark to confirm his suspicions and confess that he is really Superman. He reiterates that he is a dying man and would present no threat with this knowledge. Clark reasons that Kiley only has moments to live so he confirms that he is really Superman. He reveals his costume underneath his clothing and demonstrates his superpowers in front of Kiley. Ten minutes later the doctor confirms that Kiley has passed away with a peaceful smile on his face. Clark leaves the estate along with a number of other reporters. As Clark is typing up Kileys obituary the setting returns back to Kileys mansion where Kiley himself is waking up from a self induced coma. He had apparently used a drug which slowed his heart rate enough to make Clark believe he was a dying man. The doctor warns Kiley that the drug he used has been known to cause hallucinations and that Clark's demonstration might have been a side effect of the drug. Kiley refuses to believe that his observations were an illusion, He reveals that he is the secret leader of the Anti-Superman Gang and that he has a secret plot to lure Superman into a Kryptonite trap. The Anti Superman gang sets up the trap in one of Kileys mines. They also prepare an electronic jamming device to prevent Superman from summoning any help from his Superman robots. Clark Kent arrives on the scene to cover the story of a collapsed mine. He is escorted into a mine shaft where he is pushed into a chamber containing a huge chunk of Kryptonite rock. Clark attempts to summon his robots but the jamming device holds them at bay. Superman now realizes that his only hope is the Superman emergency squad from Kandor. They frequently monitor Superman's activities and they see that he is in need of assistance. They receive Clark's instructions to bring a can of green paint as they arrive at the scene with Supergirl. Upon arriving, they cover the Kryptonite rock with the paint which contains lead. The lead renders the Kryptonite harmless and Clark recovers. He then asks Supergirl and the Superman emergency squad to assist him in convincing Kiley that his Superman demonstration was just an illusion brought on by the medication he used to slow his heart. Supergirl and the tiny Supermen put on a show that leaves Kiley and his gang convinced that they are hallucinating. The Anti Superman gang is arrested leaving Superman to conclude that he must utilize the Superman Emergency Squad more often in the future.