Batman Unchained

Batman Unchained or by other sources as Batman Triumphant is a cancelled superhero sequel to the 1997 film Batman & Robin, which was planned for a release in mid-1999.

Plot
Sometime after the events of Batman & Robin, Batman, Robin and Batgirl do battle with the Scarecrow and flashbacks from the previous Batman films were to be shown in the film.

Cast

 * George Clooney as Bruce Wayne/Batman
 * Chris O’Donnell as Dick Grayson/Robin
 * Alicia Silverstone as Batgirl/Barbara Wilson
 * Michael Gough as Alfred Pennyworth
 * Nicolas Cage as Dr. Jonathan Crane/The Scarecrow (role offered)
 * Courtney Love as Harley Quinn (actress never hired)
 * Pat Hingle as Commissioner Gordon (expected)
 * Jack Nicholson, Danny DeVito, Michelle Pfeiffer, Tommy Lee Jones and Jim Carrey as The Joker, The Penguin, Catwoman, Two-Face and The Riddler respectively (they would return in Batman's mind as a result of the Scarecrow's fear toxins)

Why It Was Cancelled

 * 1) Batman & Robin failed at the box office (mentioned earlier).
 * 2) George Clooney admitted that he hated playing Batman.
 * 3) Joel Schumacher didn't want to make Batman fans mad again after Batman & Robin.
 * 4) Warner Brothers decided to put future Batman films on hold until further notice.

Result(s)
In 2005, Batman came back to the big screen with Batman Begins and the film had some elements that were to be shown in the cancelled sequel.

Elements from the cancelled sequel were also featured in the 2015 game Batman: Arkham Knight.