Superhero fiction is a genre mainly originating in and most common to American comic books, though it has expanded into other media through adaptations and original works.
The form is a type of speculative fiction examining the adventures of costumed crime fighters known as superheroes, who often possess superhuman powers and battle similarly powered criminals known as supervillains. Occasionally, this type of fiction is referred to as superhuman or super-powered fiction rather than superhero fiction in order to reflect that broader scope of both heroes and villains, as well as cover those characters with enhanced abilities that fall outside the classic superhero/supervillain dichotomy.
A superhero is most often the protagonist of superhero fiction, although some titles, such as Marvels by Kurt Busiek and Alex Ross, use superheroes as secondary characters. A superhero (sometimes rendered super-hero or super hero) is a type of stock character possessing "extraordinary or superhuman powers" and dedicated to protecting the public. Since the debut of the prototypical superhero Superman in 1938, stories of superheroes—ranging from brief episodic adventures to continuing years-long sagas—have dominated American comic books and crossed over into other media. The word itself dates to at least 1917. A female superhero is sometimes called a superheroine (also rendered super-heroine or super heroine). "SUPER HEROES" is a trademark co-owned by DC Comics and Marvel Comics.