Batman originally referred to as 'the Bat-Man' and still referred to at times as 'the Batman', is a fictional character, a comic book superhero co-created by artist Bob Kane and writer Bill Finger (although only Kane receives official credit), appearing in publications by DC Comics. The character first appeared in Detective Comics #27 in May 1939. He is additionally known as the Caped Crusader, the Dark Knight, the World's Greatest Detective, or simply the Bat. In the original version of the story and the vast majority of subsequent retellings, Batman's secret identity is Bruce Wayne. Batman operates in the fictional American Gotham City, assisted by various supporting characters including his main sidekick Robin, his butler Alfred Pennyworth, the police commissioner Jim Gordon, and occasional assistance from the heroine Batgirl. Unlike most superheroes, he does not possess any superpowers. He makes use of intellect, detective skills, science and technology, wealth, physical prowess, and intimidation in his war on crime.