Superman: Whatever Happened to the Man of Tomorrow? reference to one of the nicknames of Superman as the "Man of Tomorrow", and was later again used in the title of another Superman . The comic book, "Action Comics" #1, published in April 1938 by "National Allied Publications" (later renamed DC Comics), marked the first publication of the character of Superman created by Jerry Siegel and Joe Shuster. The comic quickly became a success, and its editor soon realized that it was because of the popularity of the character. In an unprecedented move at the time, National Allied Publications introduced a second comic book, "Superman", exclusively featuring the popular
Superman character and cast as well as the Justice League of America and the Super Friends (of which Superman is usually a member and most of the time, the leader). Team-ups with fellow comics icon Batman are a fan-favorite, inspiring many stories over the years. When paired, they are often referred to as the "World's Finest" in a nod to the "World's Finest Comics" series that mostly featured team-up stories between Superman and Batman during its 45-year history. In 2003, DC Comics began to publish a new series featuring the two characters titled "Superman/Batman". Minor supporting characters over the years have included Superman's technological