Doctor Who
Object

Nestenes' Central Tank

A large tank in the factory control room that holds the bubbling green liquid powering Nestene control over plastic. The tank is equipped with a control panel that, when sabotaged, causes a malfunction and leakage of the viscous green liquid. Hibbert pries its lid and smashes the control panel, sparking a malfunction and viscous green leakage. Channing watches as an Auton guards the tank, enforcing Nestene authority amid Hibbert's fatal sabotage attempt.
2 appearances

Purpose

Powers Nestene animation and control of plastic Autons

Significance

Serves as the invasion's core vulnerability; Hibbert's attack fractures Nestene operations, exposes their genocidal plans, and escalates the conflict for the Doctor and UNIT.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S7E4 · Spearhead from Space Part 4
Hibbert’s Defiance and the Nestenes’ Plan

The Nestenes’ central tank control panel is the vulnerable component of their infrastructure that Hibbert targets in his sabotage attempt. By smashing the panel with the metal bar, he causes a short circuit, leading to the spurt of green liquid and a malfunction in the tank’s operations. The control panel’s destruction is a critical moment, as it briefly disrupts the Nestenes’ control and exposes their reliance on human collaborators like Hibbert. However, the Nestenes’ swift and brutal response—Channing’s monologue and the Auton’s execution of Hibbert—demonstrates that their systems are redundant and their control is not easily broken. The panel’s destruction serves as a fleeting victory for Hibbert, underscoring the high stakes and the Nestenes’ ruthlessness.

Before: Functional and integrated into the central tank, allowing the Nestenes to regulate their control over plastic and maintain their invasion plans.
After: Destroyed, with sparks flying and green liquid leaking from the damaged panel. The malfunction is temporary, but it symbolizes the potential for human resistance to disrupt the Nestenes’ operations.
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S7E4 · Spearhead from Space Part 4
Hibbert’s final defiance against the Nestenes

The control panel of the Nestene tank is the critical interface for managing the invasion. When Hibbert smashes it with the metal bar, it shorts out, causing green liquid to spurt from the tank. This act of sabotage is the event’s turning point: it disrupts the Nestenes’ operations, however briefly, and forces Channing to reveal their true intentions. The panel’s destruction is a small but significant victory for Hibbert, even as it seals his fate. Its damage foreshadows the Doctor’s later efforts to fully dismantle the Nestene infrastructure.

Before: Fully operational, with lights and indicators active as it regulates the flow of green liquid to the Autons and other Nestene-controlled systems.
After: Shattered and sparking, with green liquid leaking from the damaged tank. The panel is non-functional, representing a critical blow to the Nestenes’ control—but one that comes too late to save Hibbert.
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