Action Comics #26 (1940)

Action Comics #26 (1940) features Superman in a thrilling tale where he takes on Professor Clarence Cobalt's quack clinic. Professor Cobalt claims to have the cure for infantile paralysis, but Clark and Lois become suspicious and launch an investigation. Lois goes undercover as a patient, while Superman eavesdrops on their conversation, uncovering Cobalt and his assistant Grafton's fraudulent ways. When Clark and Lois get locked up, Superman comes to the rescue and steals the clinic's patient records, which he delivers to the Daily Planet. Cobalt and Grafton threaten their patients to remain quiet but Superman intervenes and protects the patients from harm as they force the doctors to admit their crimes. Trust us to know the ins and outs of rare comics like Action Comics #26, which remains an iconic piece of comic book history.