All stable forms of time travel require re-writing of the traveller's biodata. Because of this, time travel makes sapients vulnerable to the influence of powerful transtemporal beings that exist outside of linear time. These beings will try to force the time traveller to become their agent/servant. It is for this reason any species that wants to become a stable, time-active race must alter itself. Gallifreyans who attend the Time Academy have their Biodata modified to include Symbiotic Nuclei, making them Junior Time Lords. This done by anointing them with Time Energies from the Eye of Harmony. Symbiotic nuclei can also be added to a subject's biodata by injecting them with Retro DNA serum in the form of a red liquid. The Nuclei are probably located in a Time Lord's hearts.
The Symbiotic Nuclei maps the Time Lord into the Space-Time Vortex with Block-Transfer Numbers. They become linked to the heart of space-time and capable of changing their time-state by thinking the right Block-Transfer equations. It also allows them to withstand the energies of the Vortex.
This symbiotic nucleus is needed to implement the Rassilon Imprimature on a Time Travel Capsule (such as a TARDIS). To achieve the full rank of Time Lord a Gallifreyan must be granted a TARDIS and form a symbiotic link with it. This Imprimature gives the Time Lord access to the Power of Creation.
This link means that Time Lords are constantly sending small temporal waves throughout the Universe. The Symbiotic Nuclei cannot be removed from a Time Lord without killing them. They can be permanently deactivated by the right type of mutagen. Such a deactivation would eliminate a Time Lord's powers and his ability to regenerate.
The following color code is used:
- Black: For information from the TV Series, including Dimensions in Time, and 1996 TV Movie.
- Blue: For information from the Novels and Audios including Target, Virgin, BCC, and Big Finish.
- Green: For information from 'licensed' reference sources such as the Technical Manual, Doctor Who Magazine, and the Role Playing Games.
- Red: For information from unofficial sources -The Faction Paradox series, behind the scenes interviews, author's speculation, and popular fan belief.
The TARDIS Technical Index is copyright Will B Swift.