|Actor:||David Gautreaux, Patrick Bell|
|Hair:||black (dark blonde in Star Trek: Phase II)|
FanonEditMontgomery Scott in the transporter room as a mission team was sent to the USS Copernicus. ("Blood and Fire", Parts 1 and 2)
He was supposed to replace Spock (Leonard Nimoy) as science officer in the proposed Star Trek: Phase II series as Leonard Nimoy claimed other obligations. Had the new series been launched, Xon would have been played by David Gautreaux.