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Star Trek: Phase II was a planned television series set to air in Spring 1978 on a proposed Paramount Television Service based on the characters of Gene Roddenberry's Star Trek. The planned series was to describe the adventures of the Enterprise crew on a second five-year mission after the completion of the first series.
The series was planned to have included William Shatner and DeForest Kelley reprising their roles as James T. Kirk and Leonard McCoy. Conspicuous by his absence was Leonard Nimoy, who declined to return due to a marketing issue over the Spock character and obligations to the play Equus.
Despite the completion of most of the sets, several television grade models (Including the Enterprise herself and many of the pilot episode's models), and twelve full scripts, plans for a series were cancelled in favor of a feature film - Star Trek: The Motion Picture - in which all of the characters made an appearance (however briefly). Decker and Ilia appeared as major characters throughout the movie.
Lieutenant Xon (now called Commander Sonak) appeared only for a few minutes and had a few lines of dialogue before being killed in a transporter accident — the actor who was to have played Xon in the series, David Gautreaux, instead made a cameo appearance in the movie as Epsilon 9's Commander Branch.
At one early stage, the character ultimately named Xon had instead been given the name Savik. A variation of that name, Saavik, was later given to a female Vulcan in the next movie, Star Trek II: The Wrath of Khan.