(a.k.a. Trimonic Cypher-Indent Key)

The TARDIS key The TARDIS key

This key "unlocks" the double-curtain trimonic barrier that protects the Main Doors using its unique complex crystalline molecular coding. The Key must be inserted into the Locking Mechanism to open the Dimensional Gateway.

The Key will glow and grow hot when its TARDIS is about to materialize nearby. The key will also vibrate when near the key-hole/sensor-plate. The Key is isomorphic and uses beta waves to detect the metabolism, body pattern, and molecular structure, of the person holding it to sees if it fits with a TARDIS's Approved Entrance File. This list can be updated and changed using the Control Console. The operator can desensitize a key to work for anyone by holding it against his head and sending the right telepathic command. If the Time Lord Operator dies, then the key becomes owner-neutral and will work for anyone.

If the operator desires, a secret compartment can created in the outer Shell of a TARDIS to hold a spare key. It is possible (with great difficulty) to construct a new key in a TARDIS Workshop. Duplicating a key takes about eight hours and the technician must ensure the new key is correct even down to atomic levels. The key can be constructed to replicate the appearance of any object or material.

Duplicate Keys for all TARDISes can be found on Gallifrey. TARDIS keys are largely the same and it is possible to "pick" a TARDIS locking mechanism by modifying an incorrect Trimonic Key with small drops of telepathically programmed mercury.

Color Key

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.

Copyright Will B Swift


Doctor Who is both copyrighted and trademarked by the BBC. The rights to various characters and alien races from the series are owned by the writers who created them. In particular, the Daleks are owned by the estate of Terry Nation. No infringement of any copyright is intended by any part of this site. All credited material on this site is copyright © the named author. All other material is copyright © Stephen Gray The Whoniverse site logo was created by Tom Hey. The drop-down menus were created from templates on CSS Play. You may not reproduce any material from this site without permission from the relevant author(s).

You visited the Whoniverse at 5:02 am BST on Sunday 21st September 2014

Colour Coding

Black: Televised Stories

Blue: Novels and Audios

Green: Licensed Reference Material

Red: Unofficial Sources & Speculation

This colour scheme is different to that used on the rest of the Whoniverse site.