The Batman movies have also had the most popular and talented group of actors/actresses too with the exception of Katie Holmes and Elle McPherson of course.
Yes, it's amazing to think of the sheer number of Hollywood stars who have appeared in the series. Nothing else comes close. You'd struggle to come up with such a list from six
seperate movies, let along six in the same series:
Jack Nicholson, Arnold Schwarzenegger, Michael Caine, Jim Carrey, Kim Basinger, Danny DeVito, Nicole Kidman, Jack Palance, Morgan Freeman, Uma Thurman, Michelle Pfeiffer, Liam Neeson, Billy Dee Williams, Gary Oldman, Christopher Walken, George Clooney, Tommy Lee Jones, Val Kilmer, Christian Bale, Drew Barrymore, Michael Keaton, Katie Holmes, Heath Ledger, Chris O'Donnell, Aaron Eckhart, Rutger Hauer, Alicia Silverstone, Maggie Gyllenhaal, Ken Wantanabe, Cillian Murphy, Tom Wilkinson...
Even the minor parts of molls and girlfriends are played by world famous supermodels like Jerry Hall and Elle MacPherson.
And let's give aknowledgement to the solid support oif character actors like Pat Hingle, Linus Roach, Robert Wuhl, Rene Auberjonois, Tracey Walter, William Hootkins, Michael Gough (still the best Alfred ever).