Three of Eight was a hologram, based on Seven of Nine, that was a fictional character in a holonovel written by The Doctor entitled Photons Be Free.

She was a former Borg drone who served aboard the USS Vortex. Three of Eight was sympathetic to the plight of the EMH character. She pleaded with Tulak to let the EMH go, stating that it had rights. When Tulak and Ensign Kymble refused to listen, she attacked them and tried to help the EMH escape. She later pleaded with Captain Jenkins to prevent the EMH character, whom she described as an intelligent individual with a passion for life, from being decompiled. However, her efforts were unsuccessful.

Three of Eight's image was later used by Tom Paris to create the character of Two of Three in his altered version of Photons Be Free. (VOY: "Author, Author")

Like Seven, Three of Eight was portrayed by Jeri Ryan.
From the Star Trek Encyclopedia (4th ed., vol. 2, p. 395), "Photons Be Free was presumably published some time after the conclusion of the episode, albeit in revised form. We suspect that the final version of the character was less like Seven of Nine, and may even have had a different name."
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