- This article refers to a character in the novel The Delta Anomaly. You may be looking for the Star Trek: Voyager character, The Doctor.
The Doctor was a serial killer known in the alternate reality created by Nero. The Doctor was known for a series of bizarre incidents in which the victims were found to have had their organs harvested. He displayed an odd interest in only certain species. In 2255, he resurfaced and began a new series of attacks that caught the attention of James T. Kirk, Leonard McCoy and Nyota Uhura. The Doctor employed advanced technology in his attacks, including nanobots and analysis indicated that he may have originated in the Delta Quadrant. (TOS novel: The Delta Anomaly)
Using advanced language recognition software, Cadet Uhura was able to deduce that The Doctor's unintelligible speech was mechanically garbled using an old Romulan military code from the era of the Earth-Romulan War. Furthermore, the actual garbled words were taken from the Romulan language, the Xanno language, and some from English. (TOS novel: The Delta Anomaly)
It should also be noted that the Borg designation for the Human species is Species 5618.
Though never specifically stated in the novel, The Doctor can be safely assumed to be a member or members of the Borg Collective, based on references to nanotechnology, "assimilation" and numbered species designations.