"Turnabout Intruder" last episode of Star Trek airs 1969
Turnabout Intruder, the final episode of the original Star Trek series, aired June 3, 1969. It was supposed to have aired March 28 but got preempted because of Dwight D. Eisenhower's death, so it didn't air until June 3. Nurse Chapel's hair is brown, which has always been blond up to this point. Lieutenant Uhura does not appear in this episode.
This episode takes place 4 years before the events in Star Trek: The Motion Picture although they were released ten years apart.