events
Superman debuts in Action Comics #1 (cover dated June 1938).

Related Wikipedia articles
Superman
DC Comics superhero
Superman is a superhero created by writer Jerry Siegel and artist Joe Shuster, first appearing in the comic book Action Comics #1, published in the United States on April 18, 1938. Superman has been regularly published in American comic books since then, and has been adapted to…Source: Wikipedia (CC BY-SA)
Action Comics 1
Comic book
Action Comics #1 is the first issue of the original run of the comic book/magazine series Action Comics. It features the first appearance of several comic-book heroes—most notably the Jerry Siegel and Joe Shuster creation, Superman—and sold for 10 cents. It is widely considered…Source: Wikipedia (CC BY-SA)
April 18
Day of the year
April 18 is the 108th day of the year in the Gregorian calendar; 257 days remain until the end of the year.Source: Wikipedia (CC BY-SA)