After spending some time in Arkham, Batman breaks out of his cell and help Ivy escape. Batman investigates Crane's lab and discovers Crane has created a new kind of toxin that creates the illusion of a perfect world, which he plans to release it into Gotham. Knowing Ivy is naturally immune to toxins, Batman uses a sample of her blood and some of her leaves to create an antidote. As soon as they are about to escape Arkham, however, Scarecrow ambushes them, having brainwashed Batman's allies.
The character became popular soon after his introduction in 1939 and gained his own comic book title, Batman, the following year. As the decades went on, different interpretations of the character emerged. The late 1960s Batman television series used a camp aesthetic, which continued to be associated with the character for years after the show ended. Various creators worked to return the character to his dark roots, culminating in 1986 with The Dark Knight Returns by Frank Miller. The success of Warner Bros. Pictures' live-action Batman feature films have helped maintain the character's prominence in mainstream culture.
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." 
Batman is often treated as a vigilante by other characters in his stories. Frank Miller views the character as "a dionysian figure, a force for anarchy that imposes an individual order". Dressed as a bat, Batman deliberately cultivates a frightening persona in order to aid him in crime-fighting, a fear that originates from the criminals' own guilty conscience. Miller is often credited with reintroducing anti-heroic traits into Batman's characterization, such as his brooding personality, willingness to use violence and torture, and increasingly alienated behavior. Batman, shortly a year after his debut and the introduction of Robin, was changed in 1940 after DC editor Whitney Ellsworth felt the character would be tainted by his lethal methods and DC established their own ethical code, subsequently he was retconned as having a stringent moral code. Miller's Batman was closer to the original pre-Robin version, who was willing to kill criminals if necessary.
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