The movie, which was directed by Joel Schumacher and also starred Arnold Schwarzenegger and Uma Thurman, was panned by critics.
However, Clooney commented that he is glad he starred in the movie as it was a commercial success and helped him join Hollywood's A-list.
"The truth is, Batman is still the biggest break I ever had. It changed my career. I wouldn't be doing this now if it hadn't been for Batman," he said.