A yeoman aboard the USS Enterprise who joins the landing party on the amusement planet in Shore Leave, where her daydreams come to life and she grows close to Doctor McCoy.
Yeoman Tonia Barrows appears in the 1966 episode Shore Leave, played by Emily Banks. She beams down to a seemingly idyllic world in the Omicron Delta region as part of the survey party.
Unaware that the planet manufactures whatever its visitors imagine, she thinks of Don Juan and is promptly accosted by him, which leaves her uniform torn. Later she muses about being a fairy-tale princess and finds a medieval gown waiting, which McCoy encourages her to wear.
The fantasy turns grim when a Black Knight charges and apparently kills McCoy with his lance, and Barrows blames herself. Once the Caretaker explains the planet's purpose and the doctor returns unharmed, she happily stays on for proper leave in his company.