American actor cast as the Vulcan science officer Xon for the unmade Star Trek: Phase II series, who instead appeared as Commander Branch of Epsilon IX in Star Trek: The Motion Picture.
David Gautreaux is an American actor with an unusual place in Star Trek history. In 1977 he was cast as Lieutenant Xon, a young full Vulcan who was to replace Spock as science officer in the planned television revival Star Trek: Phase II.
When the series was abandoned in favour of a feature film and Leonard Nimoy agreed to return, the Xon character was dropped. Gautreaux was given a different part in Star Trek: The Motion Picture (1979): Commander Branch, the officer in charge of the Epsilon IX monitoring station, who relays images of the V'Ger cloud destroying three Klingon cruisers and is lost when the cloud consumes the station.
He has since worked widely in television and theatre.