Barrett was the only performer to have had a role on all of the Star Trek series – usually not as a character but as the voice of the USS Enterprise’s computer. She also supplied the voice of the Enterprise computer in four of the Star Trek films. Her most frequent portrayal in Star Trek, besides the computer, was that of Nurse (later Doctor) Christine Chapel on Star Trek: The Original Series, Star Trek: The Animated Series, and in two of the films. She also voiced M’Ress and several other characters on The Animated Series and later played Betazoid Ambassador Lwaxana Troi on Star Trek: The Next Generation and Star Trek: Deep Space Nine.”