Batman's secret identity is Bruce Wayne, a wealthy industrialist, playboy, and philanthropist. Witnessing the murder of his parents as a child, Wayne trains himself both physically and intellectually and dons a bat-themed costume in order to fight crime. Batman operates in the fictional American Gotham City, assisted by various supporting characters including his sidekick Robin and his butler Alfred Pennyworth, and fights an assortment of villains influenced by the characters' roots in film and pulp magazines. 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.