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Nanogenes, also known as nanobots, (TV: The Doctor Dances) were a type of sub-atomic robot capable of healing wounds and restoring lost appendages. They could also act as a defence mechanism, creating soldiers capable of protecting or guarding planets and technology.
Abilities
Nanogenes looked like minuscule, glowing specks that buzzed around their targets. They were capable of healing superficial wounds in seconds and even reanimating the dead, provided they had an existing template for the individual. They were used as medical equipment by certain advanced races such as the Chula. If a patient had lost body parts such as a limb, the nanogenes could regrow a new one from scratch.
However, upon identifying the first member of an uncatalogued species nanogenes could confuse their biology as part of the overall template, including wounds and body equipment, and then reconfigure that person's body in a misshapen form and any others who came in contact with the nanogenes. In this respect, nanogenes were capable of being guided or outright reprogrammed to identify their mistakes and assume a correct template. Nanongenes could also be deactivated altogether to prevent accidental transformations and misuse of the nanogenes, as well as hide their presence on worlds where the technology was introduced before its time.
The Chula used nanogenes in war. These nanogenes enhanced the subject's physical abilities, giving them superhuman strength, telepathic abilities and Om-Com capabilities. They could also reside within a human host and emerge visibly when something necessary. (TV: The Empty Child/The Doctor Dances)
Nanogenes were also used as part of anti-theft attack systems on some spaceships. (TV: Fugitive of the Judoon)
History
In 1941, the con man Captain Jack Harkness crashed a Chula ambulance in London, planning to sell it and then allow it to be destroyed by a German bomb. At some point, the ship was damaged and millions of nanogenes released. This led to the Empty Child plague when the nanogenes found a dead child, wearing a gas mask. As they had never encountered a human before, the nanogenes believed that this was their default form. With the child as a template, they set about transforming all humans to match his attributes, with injuries and a gas mask bonded to the face.
They eventually recognised the real DNA by finding the child's mother, therefore coming to the conclusion that they were incorrect, and reversed the process. In addition to this, they also restored the missing leg of Mrs Harcourt and healed a minor burn the Ninth Doctor suffered on the palm of his hand. (TV: The Empty Child/The Doctor Dances)
Nanogenes were apparently still in use by the year 5 billion, as the Tenth Doctor "borrowed" some from the New New York Hospital. (PROSE: Peacemaker)
The Eleventh Doctor referred to the Dalek nanocloud as nanogenes. The Daleks used this nanocloud to convert humans into Dalek puppets. (TV: Asylum of the Daleks)
A set of nanogenes were part of an anti-theft attack system onboard a ship that Jack Harkness stole in an attempt to contact the Doctor. They activated and attacked him, but not long after their activation Jack escaped via a teleport. (TV: Fugitive of the Judoon)
References
Rose Tyler noted nanogenes among the things she had seen when she was sceptical that the newly regenerated Tenth Doctor was the man she knew. (TV: Children in Need Special)