Which extra was on the most Star Treks?

Answer 1

You could probably consider Majel Barrett for this category. She was married to Gene Roddenberry and in his first pilot for the original series, she played the female first officer. She is the only person to have been on all five incarnations of Star Trek. She played Nurse Chapel in the original series, the Enterprise computer voice in Next Generation, Federation computer voice in Deep Space Nine, Voyager computer in Voyager, and Computer in Enterprise. She also played Lwaxana Troi, Deanna Troi's mother, in the Next Generation.