Gravitron sabotage exposed

The Doctor’s immediate concern for Polly’s well-being shifts abruptly when Nils reveals the moonbase is now running on dwindling reserve oxygen—a desperate measure to conserve supplies. The sudden, eerie silence of the gravitron’s hum triggers the Doctor’s realization that Evans, slumped over the console, has sabotaged the system while under Cyberman control. The moment crystallizes the crew’s vulnerability: not only are they trapped with limited oxygen, but the Cybermen have already infiltrated their defenses by compromising a crew member. The Doctor’s urgent command to Ben and Jamie to restrain Evans before he regains consciousness underscores the escalating threat—this isn’t just a technical failure, but a deliberate act of war. The sabotage forces the crew to confront the reality that the Cybermen’s influence is already inside the base, turning their own people against them. The event serves as a turning point, shifting the narrative from reactive defense to a race against time to restore control before the Cybermen’s plan to alter Earth’s climate becomes irreversible.

Plot Beats

The narrative micro-steps within this event

1

Following the dome puncture, the Doctor checks on Polly's well-being, and Nils explains the use of reserve oxygen tanks. Polly notes the sudden quiet, prompting the Doctor to realize the gravitron has stopped, highlighting the immediate aftermath of the Cybermen's defeat.

anxiety to relief

Who Was There

Characters present in this moment

5

Alert and ready for action, though not yet visibly engaged in the scene.

Ben is not physically present in this specific event segment but is summoned by the Doctor’s urgent command to restrain Evans. His role in the event is implied through the Doctor’s directive, positioning him as a responsive and reliable ally ready to act on the Doctor’s orders. His absence from the dialogue underscores the immediacy of the threat and the need for swift action.

Goals in this moment
  • Assist the Doctor in neutralizing the immediate threat posed by Evans.
  • Protect the crew and the base from further sabotage.
Active beliefs
  • The Doctor’s commands must be followed without hesitation in high-stakes situations.
  • Teamwork and quick action are critical to overcoming threats.
Character traits
Responsive Reliable Action-oriented
Follow Ben Jackson's journey

Unconscious and thus devoid of visible emotion, but his state represents the insidious presence of the Cybermen within the base.

Evans is depicted as slumped over the gravitron console, unconscious and implied to be under Cyberman control. His compromised state is the direct result of Cyberman infiltration, and his sabotage of the gravitron marks a critical turning point in the narrative. The Doctor’s urgent command to restrain Evans before he regains consciousness underscores the immediate threat he poses, both as a compromised crew member and a potential agent of further sabotage.

Goals in this moment
  • None (unconscious and under Cyberman control).
  • Implied goal: Further sabotage or conversion of other crew members upon regaining consciousness.
Active beliefs
  • None (unconscious).
  • Implied belief: The Cybermen’s directive to sabotage the base and alter Earth’s climate.
Character traits
Compromised Threatening (unintentionally) Symbolic of infiltration
Follow Evans's journey

Prepared and eager to respond to the Doctor’s call for action, though not yet visibly engaged.

Like Ben, Jamie is not physically present in this event segment but is summoned by the Doctor’s command to restrain Evans. His role is implied through the Doctor’s directive, reflecting his loyalty and readiness to act. Jamie’s absence from the dialogue highlights the urgency of the situation and the need for immediate intervention.

Goals in this moment
  • Support the Doctor and Ben in restraining Evans and securing the base.
  • Protect the crew from the Cybermen’s infiltration.
Active beliefs
  • The Doctor’s leadership must be followed without question in dangerous situations.
  • Physical action is often the most effective response to threats.
Character traits
Loyal Courageous Quick to act
Follow Jamie McCrimmon's journey

Alert and alarmed, shifting from concern for Polly to urgent action upon realizing the gravitron’s sabotage and Evans’s compromised state.

The Doctor initially checks on Polly’s well-being, but his attention swiftly pivots to the eerie silence of the gravitron console. Noticing Evans slumped over the controls, he deduces the sabotage and immediately issues a sharp command to Ben and Jamie to restrain Evans before he regains consciousness. His body language and tone convey urgency, reflecting his realization that the Cybermen have already infiltrated the base through a crew member.

Goals in this moment
  • Ensure Polly’s safety and well-being.
  • Identify and neutralize the threat posed by Evans’s sabotage of the gravitron.
Active beliefs
  • The crew’s survival depends on immediate action to restore the gravitron and secure the base.
  • Evans’s unconscious state is a temporary advantage that must be exploited to prevent further sabotage.
Character traits
Observant Decisive Protective Analytical Commanding
Follow The Second …'s journey
Supporting 1

Confused and concerned, shifting from relief at her own well-being to alarm as the gravity of the situation becomes clear.

Polly expresses confusion about the oxygen supply and notes the eerie silence of the gravitron, which draws the Doctor’s attention to Evans’s compromised state. Her observations serve as a catalyst for the Doctor’s realization of the sabotage, though she does not actively participate in the subsequent action. Her role is observational, highlighting the crew’s vulnerability and the sudden shift in the base’s status.

Goals in this moment
  • Understand the base’s operational status and the source of the oxygen supply.
  • Support the Doctor and the crew in addressing the emerging threat.
Active beliefs
  • The crew’s survival depends on clear communication and quick adaptation to changing circumstances.
  • The Doctor’s expertise is essential for navigating complex threats.
Character traits
Observant Curious Supportive
Follow Nils's journey

Objects Involved

Significant items in this scene

2
Moonbase Alpha Gravitron Control Console (with Digital Counter)

The gravitron console is the central focus of this event, as its eerie silence draws the Doctor’s attention to Evans’s compromised state. The console’s sabotage by Evans, under Cyberman control, marks a critical turning point in the narrative, exposing the enemy’s infiltration and the crew’s vulnerability. The gravitron’s role in stabilizing Earth’s climate makes its failure a high-stakes threat, as the Cybermen’s plan to manipulate Earth’s weather hinges on its dysfunction. The console’s physical state—silent and inactive—symbolizes the crew’s loss of control over the base’s critical systems.

Before: Operational, humming with activity as it stabilizes Earth’s …
After: Sabotaged and inactive, its silence signaling the crew’s …
Before: Operational, humming with activity as it stabilizes Earth’s climate, monitored by the crew.
After: Sabotaged and inactive, its silence signaling the crew’s loss of control and the Cybermen’s infiltration.
Moonbase Reserve Oxygen Tanks

The reserve oxygen tanks are introduced as the moonbase’s last resort for survival, highlighting the crew’s desperate situation. Nils’s explanation of their activation underscores the urgency of the resource shortage, as the crew is now reliant on a finite supply of oxygen. The tanks’ role in the event is symbolic of the crew’s dwindling options and the high-stakes nature of their struggle against the Cybermen. Their activation marks a shift from relative stability to a race against time, as the crew must restore the gravitron and secure the base before the oxygen runs out.

Before: Standby mode, unused but available as a last-resort …
After: Activated and in use, providing a finite supply …
Before: Standby mode, unused but available as a last-resort resource for the crew.
After: Activated and in use, providing a finite supply of oxygen to the crew as they face the Cybermen’s threat.

Location Details

Places and their significance in this event

1
Gravitron Control Room (Moonbase Command Hub)

The moonbase control room serves as the epicenter of the crew’s struggle against the Cybermen, where the gravitron’s sabotage and the shift to reserve oxygen tanks are revealed. The room’s atmosphere is tense and urgent, as the crew grapples with the realization that the enemy has already infiltrated their ranks. The control room’s functional role is that of a command hub, where critical decisions are made and threats are addressed. Its symbolic significance lies in its representation of the crew’s last line of defense against the Cybermen, as well as the fragility of their control over the base’s systems.

Atmosphere Tense and urgent, with a palpable sense of desperation as the crew confronts the gravitron’s …
Function Command hub and last line of defense against the Cybermen, where critical decisions are made …
Symbolism Represents the crew’s fragile control over the base and their struggle to maintain stability in …
Access Restricted to essential crew members and the Doctor’s companions, as the control room is a …
The eerie silence of the gravitron console, drawing attention to its sabotage. The hum of the reserve oxygen tanks activating, symbolizing the crew’s desperate situation. The dim lighting and crowded consoles, reflecting the urgency and tension of the moment.

Narrative Connections

How this event relates to others in the story

What led here 1
Temporal medium

"Benoit and Hobson patch hole which shortly followed by Doctor check up on Polly and gravitron has stopped."

Hobson and Benoit patch the dome breach
S4E26 · The Moonbase Part 4
What this causes 1

"The gravatron stopping leads to the Doctor urging Ben and Jamie to act quickly before Evans comes back and they act quickly to remove him from the console."

Doctor secures Cyberman control device
S4E26 · The Moonbase Part 4

Themes This Exemplifies

Thematic resonance and meaning

Key Dialogue

"DOCTOR: Polly! Are you all right?"
"POLLY: Oh yes. Oh. Oh, where's that air coming from?"
"NILS: Reserve tanks of oxygen."
"POLLY: Oh. Well why couldn't we have had those before?"
"NILS: And lose all our oxygen?"
"POLLY: Oh, I see. It's so quiet."
"DOCTOR: Yes, it is, isn't. The gravitron's stopped!"