A Return Circuit can be programmed into a TARDIS's Dematerialization Circuit. It acts as a primary override to prevent a TARDIS from permanently leaving a particular planet and/or time. If the operator was to make a successful space-time jump, they would invariably find that their next journey would return them right back to a pre-programmed time zone. The Return Circuit doesn't interfere with the override commands of a Remote Operations Module.
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.