Re: Why didn't Val Kilmer return for Batman & Robin?
Certainly, around the same time, The Island of Doctor Moreau, in which Kilmer also appeared, led to numerous stories about what a nightmare he was on set, so Shumacher may have had some point here.
Those interested in the behind-the-scenes of Hollywood sci-fi should check out the book The Greatest Sci-Fi Movies Never Made
by David Hughes. He does an entire chapter on The Island of Dr. Moreau.
Kegg: "You're a Trekkie. The capacity to quibble over the minutiae of space opera films is your birthright."