Batman is a fictional superhero appearing in American comic books published by DC Comics. The character was created by artist Bob Kane and writer Bill Finger, and first appeared in Detective Comics #27 (1939). Originally named the "Bat-Man", the character is also referred to by such epithets as the Caped Crusader, the Dark Knight, and the World's Greatest Detective.

Batman was one of the few superhero characters to be continuously published as interest in the genre waned during the 1950s. In the story "The Mightiest Team in the World" in Superman #76 (June 1952), Batman teams up with Superman for the first time and the pair discover each other's secret identity. Following the success of this story, World's Finest Comics was revamped so it featured stories starring both heroes together, instead of the separate Batman and Superman features that had been running before. The team-up of the characters was "a financial success in an era when those were few and far between"; this series of stories ran until the book's cancellation in 1986. Batman comics were among those criticized when the comic book industry came under scrutiny with the publication of psychologist Fredric Wertham's book Seduction of the Innocent in 1954. Wertham's thesis was that children imitated crimes committed in comic books, and that these works corrupted the morals of the youth. Wertham criticized Batman comics for their supposed homosexual overtones and argued that Batman and Robin were portrayed as lovers. Wertham's criticisms raised a public outcry during the 1950s, eventually leading to the establishment of the Comics Code Authority, a code that is no longer in use by the comic book industry. The tendency towards a "sunnier Batman" in the postwar years intensified after the introduction of the Comics Code. Scholars have suggested that the characters of Batwoman (in 1956) and the pre-Barbara Gordon Bat-Girl (in 1961) were introduced in part to refute the allegation that Batman and Robin were gay, and the stories took on a campier, lighter feel. In the late 1950s, Batman stories gradually became more science fiction-oriented, an attempt at mimicking the success of other DC characters that had dabbled in the genre. New characters such as Batwoman, Ace the Bat-Hound, and Bat-Mite were introduced. Batman's adventures often involved odd transformations or bizarre space aliens. In 1960, Batman debuted as a member of the Justice League of America in The Brave and the Bold #28 (Feb. 1960), and went on to appear in several Justice League comic series starting later that same year.

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