#4 Would have been great: Jackie Chan
Everyone knows how tough Bruce Lee was, but not many realize that, while the Dragon did many of his own stunts, there were some things that were just too risky for him to perform.
Cue Jackie Chan, who began his career as Bruce Lee's stunt double. After Lee's death, Jackie Chan became a star in his own right. Instead of trying to be a tough guy like Lee, Chan relied on his naturally sunny disposition and sense of humor to create sympathetic characters the audience loved to cheer on.
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Jackie Chan was famous during most of his career for performing all of his own stunts, including dangerous ones that landed him in the hospital. The star used to joke that no insurance company in the world would touch him.
Chan's agility, martial arts prowess, and speed would have made him a great WWE Superstar by themselves. But add in his magnetic personality and ability to play slapstick, and he could have been one of the most entertaining forces in 'sports entertainment' history.