Doctor Who
Object

Makeshift Signal Transmission Probe

A jury-rigged device shoehorned together from scavenged circuit boards, frayed wires, and salvaged antenna rods. Its cracked plastic housing is discolored from heat, and the array of blinking LEDs pulses unevenly as the device intercepts Sutekh’s controlling beam passing through Marcus Scarman. Laurence’s discovery of this signal link forces the Doctor to confirm Scarman’s total subjugation to Sutekh’s will.
2 appearances

Purpose

To intercept and transmit Sutekh’s neural control signal originating from the tomb on Mars, revealing the mechanism by which Sutekh bends Scarman to his will.

Significance

This makeshift probe exposes the Achilles’ heel of Sutekh’s plan: a human conduit under constant mental domination. Its activation changes the stakes of the crisis from a contained archaeological threat to an immediate, life-or-death confrontation with an escaped celestial tyrant.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S13E1 · Terror of the Zygons Part 1
Sarah interrupts for Harry's shooting news

The Doctor’s circuit board radio probe system lies at the heart of a tense technical discussion; it is probed, examined, and verbally tied to bypassing localised jamming in the immediate vicinity.

Before: Assembled from scavenged parts, functional but improvised and fragile, held by the Doctor in his hands.
After: Unchanged in state but now overshadowed by the urgent telephone call; still held by the Doctor as the focus shifts from technology to survival.
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S13E10 · Pyramids of Mars Part 2
Mummies seize Clements outside lodge

The makeshift signal transmission probe intercepts Sutekh’s controlling beam passing through Marcus Scarman, revealing the link between Earth and Mars. Laurence’s discovery of this device confirms Scarman’s subjugation to Sutekh’s will, underscoring the ancient technology’s role in Sutekh’s resurrection.

Before: Partially disassembled and integrated into the lodge’s observatory, its cracked plastic housing and tangled wires a testament to hasty improvisation amid crisis.
After: Repurposed into the Doctor’s plan; its intercepted signal becomes the crucial target for blocking, its failure exposing the depth of Sutekh’s control.
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