Xon

Xon (pronounced Zahn) is a fictional character written for the unpublished 1970s Star Trek TV show 'Phase II'. Due to Spock having his own command by the time of Phase II Xon was his placement aboard the Enterprise. In development Lenard Nemoy had left the project and thus was unable to be in the show as Spock. Xon was created to compensate for Nemoy's absence. Xon is a pureblooded Vulcan aboard the USS Enterprise under Captain Kirk in the late 2270s. Xon is a young genius, he is the Vulcan equivalent of a 22 year old Human in age. Vulcan Science Academy put a lot of effort into getting him into the chief science officer role aboard the USS Enterprise. Kirk had expeced someone older, around Spock's age to fill the shoes. Kirk had approved not realizing Xon's age as reports indicated Xon was a prominent teacher and scientist.