Batman: The Killing Joke (2016) is a dark, R-rated animated adaptation of Alan Moore's seminal graphic novel, delving deep into the twisted psyche of the Joker. The film follows Batman as he hunts for the escaped Clown Prince of Crime, only to find himself confronting a personal and brutal attack on Commissioner Gordon and his daughter Barbara (Batgirl). The Joker's goal is to prove a diabolical point: that one bad day can drive anyone as insane as he is, mirroring his own tragic fall into madness.

Directed by Sam Liu, the film features stellar voice performances from Kevin Conroy as Batman and Mark Hamill as the Joker, reprising their iconic roles with chilling intensity. The animation captures the gritty, noir-inspired aesthetic of the source material, though the narrative expands on Batgirl's role in the first act, adding depth before converging with the original plot. While the film's dark themes and violent content have sparked debate, it remains a compelling exploration of the Batman-Joker dynamic.

Viewers should watch Batman: The Killing Joke for its psychological depth, standout voice acting, and faithful adaptation of a classic story that questions the fine line between sanity and chaos. It's a must-see for DC fans seeking a mature, thriller-oriented take on these legendary characters.