The legendary star reflects on how clinical depression led him to acting, the unlikely ways he broke into the movies and was cast in 'Star Wars,' why he long yearned to escape "leading man" roles and to play "character parts" and why he so loves his current challenge of playing an acerbic psychotherapist battling Parkinson's disease on Apple TV's Emmy-nominated comedy. Learn more about your ad choices. Visit megaphone.fm/adchoices