Following Val Kilmer's portrayal of the caped crusader in Batman Forever, the fourth Batman feature stars George Clooney under the pointy-eared cowl, with Chris O'Donnell returning as Robin the Boy Wonder. This time the dynamic duo is up against the nefarious Mr. Freeze (Arnold Schwarzenegger), who is bent on turning the world into an iceberg, and the slyly seductive but highly toxic Poison Ivy (Uma Thurman), who wants to eliminate all animal life and turn the Earth into a gigantic greenhouse.