'The Killing Joke', which features dark and considerably more "adult" content is often cited as one of the best Dark Knight stories ever written. Photo: Warner Brothers/DC
'The Killing Joke', which features dark and considerably more "adult" content is often cited as one of the best Dark Knight stories ever written. Photo: Warner Brothers/DC
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The Dark Knight gets darker as more comic book movies risk R-rating

Warner Brothers says it is at a point where it can choose to be 'authentic to the source material'

'The Killing Joke', which features dark and considerably more "adult" content is often cited as one of the best Dark Knight stories ever written. Photo: Warner Brothers/DC
'The Killing Joke', which features dark and considerably more "adult" content is often cited as one of the best Dark Knight stories ever written. Photo: Warner Brothers/DC
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