EXCLUSIVE: 'Batman & Robin' 20 Years Later -- Alicia Silverstone & Chris O'Donnell Look Back

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It's been two decades since George Clooney donned Batman's cape and cowl to fight crime alongside Alicia Silverstone and Chris O'Donnell in director Joel Schumacher's Batman & Robin.

In honor of the film's 20th anniversary on Tuesday, ET's Denny Directo sat down with Silverstone and O'Donnell, who reflected on the cult classic and the film's famously over-the-top costumes.

"They made this like, plaster body mold of me and my entire face and every inch of my body," recounted O'Donnell, who starred as Robin, Batman's crime fighting partner. "Just watching the process of them build this costume and then all of a sudden show up on set one day-- when it was finished -- was like, 'Oh my God, I can't believe I'm going to put that on and be a superhero.'"

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As for Silverstone, who starred as Batgirl, she had a different take on her costume, which she said over-accentuated her curves a bit.

"I was just like, didn't want to be in the suit. It was so uncomfortable," the actress recalled, adding that if she were to ever reprise her role, she'd like to see some changes in the wardrobe. "Maybe we can make the boobs a little smaller, they were massive… maybe tone down the nipples."

Warner Bros.

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The film, which was critically panned upon release, has found a following of fans in the years since who appreciate the movie's campiness, cheesy one-liners and bizarrely colorful art direction. And for O'Donnell, who grew up loving Batman, it was like a dream come true.

"I grew up as a kid, you know, I had all the Batman and Robin toys, I watched the TV show," he shared. "It was quite a thrill. I got to drive the Batmobile for Christ sakes. Come on!"

O'Donnell actually made his debut as Robin in 1995's Batman Forever, where he starred opposite Val Kilmer, who had taken over the role of the Dark Knight from Michael Keaton.

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However, Batman & Robin was Silverstone's first time taking on the mantle of Batgirl, and the actress said she'd welcome another shot at playing the crime fighting heroine.

"I'd like to do it again," she explained. "I think if I did it right now I'd be a much better Batgirl."

Batman & Robin
also starred Arnold Schwarzenegger as the villainous Mr. Freeze and Uma Thurman as the deadly Poison Ivy.