One of Three was a former Borg drone and a character in Tom Paris' adaptation of Photons Be Free. She was one of a set of identical triplets along with Two of Three and another sister.

While The Doctor played the holonovel in 2378 as the CMO's medical assistant, the CMO character mistook Two of Three for One of Three. (VOY: "Author, Author")

This character was only mentioned in dialogue.
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