Deborah Downey
Deborah Downey  is a former actress who, at the age of 18, played Girl #1 in the  third season episode . She also performed vocals in the song "Hey, Out There!". Downey's boyfriend at the time, guitarist Craig Robertson co-wrote the music featured in the episode with actor Charles Napier, while writer Arthur Heinemann contributed the lyrics. (These Are the Voyages: TOS Season Three, p. 555; Star Trek: The Original Series Soundtrack Collection liner notes)

Downey filmed her scenes between Friday  and Friday  at Desilu Stage 9 and Stage 10. She was also called in for a music recording session on Wednesday , and a makeup and costume test on Thursday  at Stage 9.

She and Napier also appeared together that year in a Western called The Hanging of Jake Ellis. Her album, Painting Pictures, features Heading Into Eden, a reworked version of a song from the episode. She retired from acting shortly after appearing on Star Trek. Since that time, she has made her living as a noted painter, under the name Deborah Lyons. Her portraits include astronaut Rick Searfoss and Trek-creator Gene Roddenberry. She has also done portraits of Star Trek actors.

External links
  – official site
 

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Performers
TOS performers