Fabula
Object
Object

Key Tracer

A compact handheld device produced by the Doctor to detect residual energy signatures from fragments of the Key to Time. Its narrow probe extends when active, the dial's needle flickering uncertainly even when idle. Romana identifies it as Gallifreyan technology repurposed for this mission, its calibration critical for navigating temporal distortions within the TARDIS and surrounding spaces. The device's surface may show signs of heavy use and yellowing from prior missions. The Doctor brandishes it casually during technical debates, with brief activation moments before the vessel's engine destabilizes.
3 appearances

Appearances in the Narrative

When this object appears and how it's used

3 moments
S16E5 · The Pirate Planet Part 1
Doctor and Romana debug TARDIS materialization

The Key Tracer is inserted by the Doctor into its socket to initiate materialization. Its activation does not prevent failure, highlighting that even technology aligned to the Doctor’s methods cannot compensate for procedural omissions. The device’s brief functionality underscores the futility of his arrogant approach.

Before: Compact handheld device held inactive on the console, its needle flickering uncertainly when inactive
After: Returned to inactive state in its socket after materialization fails
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S16E5 · The Pirate Planet Part 1
Doctor and K9 assess Time Key fragment

The Key tracer is inserted into its socket by the Doctor to scan the fragment’s properties. The device’s activation precedes the TARDIS’s sudden failure, suggesting the scan may have triggered or at least coincided with the navigational collapse through unknown temporal interference.

Before: Inactive in its socket in the TARDIS console room
After: Active and implicated in the TARDIS’s materialisation failure
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S16E1 · The Ribos Operation Part 1
Doctor entrusts Romana with the mission

The Doctor retrieves a compact device with a dial and probe, its intermittent flickering needle serving as a reminder of the castle's defensive lethality and validating Romana’s recognition of the lethal environment.

Before: Carried by the Doctor in the TARDIS, unused.
After: Produced and silently acknowledged as active and relevant to their immediate safety.
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