Object
Hidden Sontaran Tracking Scanner
A flat metal stud embedded in the heather (or terrain), indistinguishable from foliage until activated by intruders. Its surface bears no seams or controls, though a low hum vibrates through the earth as it extends a narrow sensor probe. The device emits no visible light but locks onto heat signatures (tracking three individuals simultaneously in one instance) with mechanical precision. When triggered, its capture sequence is inaudible to humans but prompts immediate Sontaran response elsewhere. Identified by the Doctor as Terullian technology, it serves as an alien monitoring tool for heat and movement detection within a restricted zone.
4 appearances
Purpose
To covertly detect and track life signs for later Sontaran interception, using minimal sensor exposure to avoid drawing attention
Significance
Exposes the survivors' fatal misjudgment—dismissing the Doctor's warnings while a hidden alien threat watches them. Its activation forces the trio into desperate flight, highlighting the tension between human skepticism and alien preparedness
Appearances in the Narrative
When this object appears and how it's used