The early, pulp-inflected portrayal of Batman started to soften in Detective Comics #38 (April 1940) with the introduction of Robin, Batman's junior counterpart. Robin was introduced, based on Finger's suggestion, because Batman needed a "Watson" with whom Batman could talk. Sales nearly doubled, despite Kane's preference for a solo Batman, and it sparked a proliferation of "kid sidekicks". The first issue of the solo spin-off series Batman was notable not only for introducing two of his most persistent enemies, the Joker and Catwoman, but for a pre-Robin inventory story, originally meant for Detective Comics #38, in which Batman shoots some monstrous giants to death. That story prompted editor Whitney Ellsworth to decree that the character could no longer kill or use a gun.
In a paleolithic Gotham, a primitive tribe simply known as The Deer people encounters a shirtless amnesiac Bruce Wayne equipped with his utility belt in his hand emerging surrounded by a swarm of bats from the cave where Anthro recently died. The tribe of the Deer people mistakenly believe Bruce to be a Bat God dubbed him as The Man of Bats after discovering a set of markings featuring the insignia of Batman, Superman and Wonder Woman inscribed on the cave wall next to the body of Anthro. Bruce, still uncertain of where he is, takes notice of a somewhat familiar crashed rocket ship upon investigating he discovers the contents: Superman's cape (the only thing left intact), a destroyed bat signal, and a shredded copy of the Daily Planet which was launched by the Daily Planet staff prior to the use of the Miracle Machine.
Batman became a popular character soon after his introduction, and eventually gained his own title, "Batman". As the decades wore on, differing takes on the character emerged. The late 1960s Batman television series utilized a camp aesthetic associated with the character for years after the show ended. Various creators worked to return the character to his dark roots, culminating in the 1986 miniseries Batman: The Dark Knight Returns, by writer-artist Frank Miller. That and the success of director Tim Burton's 1989 Batman motion picture helped reignite popular interest in the character. A cultural icon, Batman has been licensed and adapted into a variety of media, from radio to television and film, and appears on a variety of merchandise sold all over the world. The Batman goes by numerous nicknames, such as The Dark Knight, The Caped Crusader, World's Greatest Detective and the Defender of Gotham.
The Batcave is Batman's secret headquarters, consisting of a series of subterranean caves beneath his mansion, Wayne Manor. As his command center, the Batcave serves multiple purposes; supercomputer, surveillance, redundant power-generators, forensics lab, medical infirmary, private study, training dojo, fabrication workshop, arsenal, hangar and garage. It houses the vehicles and equipment Batman uses in his campaign to fight crime. It is also a trophy room and storage facility for Batman's unique memorabilia collected over the years from various cases he has worked on. In both the comic Batman: Shadow of the Bat #45 and the 2005 film Batman Begins, the cave is said to have been part of the Underground Railroad.
Natalya Trusevich: A Ukrainian concert pianist and girlfriend of Bruce Wayne, Natalya grew frustrated with Bruce's closed-off demeanour, until he was urged by Alfred to reveal to her his secret identity. Shortly after, Natalya was abducted by the Mad Hatter who attempted to torture her into revealing the identity of Batman. Natalya refused to divulge Bruce's secret and was thrown by the Mad Hatter from a helicopter to her death.