Supposedly, Bruce Lee was originally looked at for the role of Caine but for whatever reason it didn't happen. In my opinion, I still think David Carradine did a great job. I always enjoyed the original Kung Fu.I read that David Carradine, Kwai Chang Caine in the TV series Kung Fu, had no martial atrs training when he took the role in the TV series. But that he was a professionally trained dancer and learned the choreographed moves in the show with his dance background. After taking the role he studied karate, kung fu, and tai chi.