Director Ang Lee is developing a prequel to his crossover smash Crouching Tiger, Hidden Dragon, USA Today reports. Lee — who is in the early stages of writing the script — hopes to bring back Tiger leads Chow Yun Fat and Michelle Yeoh. However, the acclaimed auteur concedes that with the current pic headed towards a North American gross of $100 million, the follow-up would be an expensive proposition. Notes Lee: "Everybody's going to charge me five times as much."