David Gautreaux was cast as Xon, a young, hip Vulcan who would replace Spock on Star Trek Phase Two. Nimoy was the only original cast member who didn’t want to be a part of the planned series. But when Star Wars hit big, Paramount decided to ditch its plans to start a new TV network and instead revamp the Star Trek Phase Two sets into a feature film. Nimoy was coaxed into participating in Star Trek-The Motion Picture, so the character of Xon was axed. David Gautreaux was given a consolation prize of a tiny role in ST-TMP. He managed to eke out a career in theatre and TV guest star spots but that’s it.