On Earth-One, Catwoman and Batman were often at odds since they were on different sides of the law, but eventually, Catwoman reformed and Batman accepted her as a vigilante in Gotham City. Coincidentally, Bruce Wayne also started a romantic relationship with Selina Kyle. Despite these developments, Catwoman realized Batman and Bruce could not fully trust her and she left Gotham.
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.
Batman meets and regularly works with other heroes during the Silver Age, most notably Superman, whom he began regularly working alongside in a series of team-ups in World's Finest Comics, starting in 1954 and continuing through the series' cancellation in 1986. Batman and Superman are usually depicted as close friends. Batman becomes a founding member of the Justice League of America, appearing in its first story in 1960s Brave and the Bold #28. In the 1970s and 1980s, Brave and the Bold became a Batman title, in which Batman teams up with a different DC Universe superhero each month.
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.