An absence detector was a component of TARDISes. Marnal mentioned the absence detectors as one of the important parts of the Doctor's TARDIS that wasn't working. (PROSE: The Gallifrey Chronicles)
Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.