Cillian Murphy initially auditioned for the role of Batman in The Dark Knight films, it has been revealed.
The Irish actor has been seen trying out for the role of the superhero in Batman Begins with the famous black suit, after a photograph was released from The Dark Knight Trilogy: Ultimate Collector's Edition, reported Batman-News.com.
Amy Adams - who played Lois Lane in Zack Snyder's Man Of Steel - did a screen test opposite Christian.
The director explained Christian was the perfect pick for Batman, because he nailed the voice.
Christopher said in the commentary: "The casting process was not about acting ability or chemistry or any of those things. It's visual iconography. Christian figured this out before the screen test that you could not give a normal performance, you could not give an ordinary performance.
"Christian's voice was a big part of the impression he made on the test. He had decided that Batman needed to have a different voice to Bruce Wayne and that he needed to put on a voice that supported the visual appearance of the character."
The special box-set, which comes with six Blu-ray discs featuring all three films in Christopher's Batman series, also features a 48-page photo book of the trilogy, over 90 minutes of new special features and a letter from the filmmaker.