Colleen Thornton
Colleen Thornton  was the former actress who (together with her twin sister Maureen) appeared as the Barbara series androids in the  second season episode . She filmed her scenes on Wednesday  at Desilu Stage 10. 

Aside from her role on Star Trek, she also appeared with her sister as a "Hippie Twin" in film Coogan's Bluff (1968), with Seymour Cassel, Albert Henderson, Andy Epper, and Allen Pinson.

During the late 60s, the Thornton sisters became known as singers, and for a time, belonged to a troupe that performed the musical . The sisters, identified as "The Gemini Twins" of Hollywood, were ejected from Acapulco, Mexico, in early January, 1969, for performing their production while only carrying a tourist visa. ('Mexican Authorities Cut Play Hair Short', Playground Daily News [Forth Walton Beach, FL], 9 January 1969, p. 20.)

In 1970, both sisters attended the  concert on Maui, with footage of both sisters at the concert later  on the 2020 Blu-Ray/DVD release of .

Thornton left acting and continued to work as a professional singer. By 1974, she was married to guitarist Richard Fortune, and was known for a time as Colleen Fortune. That year, the couple released the single "". By 1978, they had started , with Colleen and Maureen appearing on the debut album,  (1978), as both singers, and on the album's cover. By end of 1982, Colleen left the band.

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Performers
TOS performers