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Statements from Janet Scott Batchler. According to an interview with Janet Scott Batchler, Tim Burton's only involvement with Batman Forever as producer was approving Joel Schumacher as director and Lee and Janet Scott Batchler as the writers. Burton did not contribute story ideas, though he did give Schumacher his input. And by the time the Batchlers signed on, Schumacher already had hired Tommy Lee Jones to play Two-Face. The Riddler was also not considered for the villain until Schumacher and the Batchlers were at the development stage when Warner Bros. wanted two villains in the movie; they wrote the role with Robin Williams in mind, but no deal was made with him. Also, it was Schumacher who wanted to bring in the character of Robin and the Batchlers turned to their assistant, who grew up in the circus, for research. The character of Dr. Chase Meridian was also created as a way to challenge both sides of Batman's personality, with Nicole Kidman's name mentioned for the role in the early stages, but ultimately, Joel Schumacher originally cast Renee Russo as Chase when Schumacher wanted Michael Keaton to come back and play Batman. After some negotiating, Keaton left the film as he never liked the idea of Batman with a bigger role at the time, and Warner Bros. spent $30 million on both Keaton and Williams. Renee Russo was deemed too old to play Kilmer's love interest, and therefore was replaced by Nicole Kidman.
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The Batchlers wrote two drafts for Batman Forever with Michael Keaton as Batman, Robin Williams as The Riddler, and Tommy Lee Jones as Two-Face before Val Kilmer and Jim Carrey were cast in the film. The first two drafts were the same as they were in the finish film, with grounded heroes and over the top/flamboyant/cartoonish villains, though they're a lot more provost. Akiva Goldsman did the subsequent drafts that're more in line with both the theatrical cut and the as-of-yet released Schumacher Cut of Batman Forever.