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.
Master of Disguise: Has mastered the art of disguise by the time he was 23. Has further learned Expanded Disguise techniques by the time he was 26. Batman has many aliases he uses to infiltrate the underworld or just to go undercover in public situations. His current aliases are: Matches Malone, Thomas Quigley, Ragman, Detective Hawke, Sir Hemingford Grey, Lester Krutz, Frank Dixon, Gordon Selkirk, and Mr. Fledermaus.
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Eventually recovering and escaping, Batman started investigating both the toxin and its first victim. Discovering the latter to the Joe Chill, Batman learnt that Joker knew his identity and saved a family from being murdered in the same vein as his parents. With Joker terrorizing the city, he tried to forge an alliance with the Court of Owls to help stop the criminal's plan, only to be turned away. With help from Alfred's daughter Julia, Dick and Gordon, Batman discovered the substance Dionesium, which had given Joker regenerative capabilities and made him immune to the toxin. After Joker broke into the Batcave and attacked Alfred, Batman sent Grayson to distract the Clown Prince of Crime whilst he searched for a pool of Dionesium, eventually finding one after retracing Joker's escape route after his attempt to kill the entire Bat-Family.
Because Bruce Wayne is retired at the beginning of The Dark Knight Returns, we don’t get to see the suit right away. Instead we get to listen to a conversation between Bruce and a soon to be retired Commissioner James Gordon. When Bruce opens his mouth, we hear the gravely baritone voice of an old Robocop, which works perfectly with the character. Once he decides that he has had enough of the crime on the streets and suits up again, we see that just because Bruce got old, doesn’t mean he let himself go.
April Clarkson (Midnight): April was a GCPD officer who briefly dated Bruce Wayne and assisted him as Batman in tracking down the criminal known as Midnight, who had begun terrorizing Gotham and gruesomely murdering the city's most corrupt. Bruce developed strong feelings for April and was devastated to eventually discover that she was in fact the deranged murderer all along.
Batman quickly goes to the GCPD headquarters, where the Joker's latest attack took place. Previously, he had defeated the Joker and sent him to prison, where an unnamed person surgically removed his face. Later at the Batcave, Batman runs several traces for on previously collected samples of Joker Venom to see if any was found on the scene at police headquarters. As several of Batman's allies call, offering assistance in taking down the Joker, Batman declines, saying that whatever the Joker is planning, it is between him and Batman. In that moment, the Joker broadcasts a message on live TV, saying that he will kill Mayor Hady. The GCPD reinforces the City Hall to protect the Mayor, but the Joker poisons all the cops and security guards, leaving Batman, Commissioner Gordon and the Mayor as the only survivors. Batman investigates the chemical compounds used on the cops and finds three additional non-active chemicals: Aspirin, Chlorine, and Ethane. A, C, E. Batman realizes that the Joker is sending him back where it all started; to A.C.E. Chemicals. There, he finds a person dressed as the Red Hood. Batman is aware that the mysterious stranger is not the Joker, but suddenly, he is knocked aside by a giant wooden mallet. Batman falls into an empty chemical vat, while the stranger reveals herself as Harley Quinn. A chemical bath begins to pour into the vat, while Harley proclaims that the Joker is planning something not even she can comprehend.
Back in the 90s comics were prone to some wild publicity stunts to sell issues. The most notable events were the Death of Superman and a villain known as Bane breaking Batman's back. This forced Bruce Wayne to pass the mantle of Batman on to a man named Jean-Paul Valley. Valley ended up going a little crazy. He did not adhere to Batman's rule of "no killing" and made a lot of deadly modifications to the Batsuit. When Wayne got word of Valley's methods and Bane's crime-spree, he went on a spirit journey similar to his first quest to become Batman.
The popularity of the Batman TV series also resulted in the first animated adaptation of Batman in The Batman/Superman Hour; the Batman segments of the series were repackaged as The Adventures of Batman and Batman with Robin the Boy Wonder which produced thirty-three episodes between 1968 and 1977. From 1973 until 1986, Batman had a starring role in ABC's Super Friends series; which was animated by Hanna-Barbera. Olan Soule was the voice of Batman in all these shows, but was eventually replaced during Super Friends by Adam West, who also voiced the character in Filmation's 1977 series The New Adventures of Batman.
The character of Batman has appeared in various media aside from comic books, such as newspaper syndicated comic strips, books, radio dramas, television, a stage show, and several theatrical feature films. The first adaptation of Batman was as a daily newspaper comic strip which premiered on October 25, 1943. That same year the character was adapted in the 15-part serial Batman, with Lewis Wilson becoming the first actor to portray Batman on screen. While Batman never had a radio series of his own, the character made occasional guest appearances in The Adventures of Superman starting in 1945 on occasions when Superman voice actor Bud Collyer needed time off. A second movie serial, Batman and Robin, followed in 1949, with Robert Lowery taking over the role of Batman. The exposure provided by these adaptations during the 1940s "helped make [Batman] a household name for millions who never bought a comic book".
Following the 2016 DC Rebirth continuity reboot, Batman and Catwoman work together in the third volume of Batman. The two also have a romantic relationship, in which they are shown having a sexual encounter on a rooftop and sleeping together. Bruce proposes to Selina in Batman vol. 3, #24 (2017), and in issue #32, Selina asks Bruce to propose to her again. When he does so, she says, "Yes."