Beginning with the introduction of Superman in 1938 in Action Comics #1 (an anthology of adventure features) comic books devoted to superheroes (heroic people with extraordinary or superhuman abilities and skills, or god-like powers and attributes) ballooned into a widespread genre, coincident with the beginnings of World War II and the end of the Great Depression.

After World War II superhero comic books gradually declined in popularity, their sales hindered in part by the publication of Seduction of the Innocent and the investigations of The Senate Subcommittee hearings on juvenile delinquency.

Marvel Comics followed suit in the 1960s, introducing characters such as Spider-Man, the Fantastic Four, the Hulk, Thor, the X-Men and Iron Man who featured more complex personalities which had more dramatic potential.

This was eventually supplanted by more sophisticated character driven titles of The Uncanny X-Men by Chris Claremont and John Byrne for Marvel and The New Teen Titans by Marv Wolfman and George Pérez for DC.

The comic book mini series Kingdom Come brought an end to the popularity of the anti-hero and encouraged instead a reconstruction of the genre with superhero characters that endeavored to combine artistic and literary sophistication with idealism.