After the apparent death of Superman, Batman saw an individual dressed like the Flash appear before him in the Batcave. Insisting that he knew him, the individual urged Batman meet with Barry Allen before disappearing. Urged by his suspicions, Batman uncovered a button in one of the walls and met with Allen. Deciding to investigate this together, they began to suspect that ramifications to the timeline might have not been caused by Barry, but another influence. At some point, he discovered the Joker was still alive and captured the Clown Prince of Crime, holding him in the Batcave to help investigate the truth of Nth.
In Batman and Robin's third storyline, "Blackest Knight," it is revealed that the body left behind at the end of Final Crisis #6 was actually a clone created from a failed attempt by Darkseid to amass an army of Batmen. Because of this, the skull that was used by the Black Lantern Corps and reanimated by Nekron was a fake. Dick Grayson, thinking it was Bruce Wayne's real body, attempted to resurrect it in a Lazarus Pit only to be met with a fierce, mindless combatant. He then realized the truth about the body.
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.
Harley Quinn: Best known as "The Joker's Girlfriend", Harley has had occasional romantic encounters with Batman, most notably her kiss with him in the episode Harley's Holiday from Batman: The Animated Series. Recently, in the The New 52, there have been a couple of stories in which Harley became infatuated either with Bruce Wayne or Batman. These attractions appear to be entirely one-sided and Batman has shown no signs of attraction towards Harley.