Star Trek: Phase II was the Star Trek series that never happened. advertisement /Film. ... the showrunners invented a new Vulcan character named Xon, to be played by actor David Gautreaux.

Xon was actually cast and was to be played by actor David Gautreaux. ... Turning Star Trek: Phase II into The Motion Picture was a messy process, but it was a relatively quick one.

But, of course, Xon himself never actually appeared in any version of Star Trek on screen. When Phase II was transformed into Star Trek: The Motion Picture , Leonard Nimoy agreed to return as ...