Barclay teaches sabotage under Cyber threat

In the cramped bunk room, Barclay reveals a covert sabotage plan to Ben and Polly as the Cybermen’s arrival looms. After confirming the Doctor’s stable condition, Barclay—initially dismissive of tampering with the rocket—admits a hidden ventilation shaft could provide access to the silo. He sketches a precise, undetectable method to disable the fuel pump by snipping a pin inside a servo panel, ensuring the rocket’s engines fail at launch without immediate discovery. The tension escalates as Barclay’s instructions grow increasingly urgent, culminating in the klaxon’s blare signaling the Cybermen’s breach. This moment crystallizes Barclay’s pragmatic ruthlessness, the desperate stakes of the mission, and the abrupt shift from covert planning to life-or-death crisis. The dialogue underscores the group’s dwindling time and the high cost of failure, with Barclay’s technical precision contrasting sharply with the looming existential threat outside.

Plot Beats

The narrative micro-steps within this event

2

Following the sound of the klaxon, Barclay describes how to find a panel marked 'Plug Servo Leads' next to a walkway along the rocket. He instructs Ben to unscrew the panel, snip a pin from one of the four plugs and put it back.

planning to urgency

Ben asks what snipping the pin will do, and Barclay explains that the fuel pump pressure will fall to zero at blast off. He also makes a point to note that this problem won't be discovered for at least six months.

curiosity to reassurance

Who Was There

Characters present in this moment

6

Determined but tense, with a underlying current of adrenaline-fueled urgency. His frustration at the initial failure to open the grill is quickly replaced by a laser focus on the sabotage plan, though the klaxon’s blare heightens his sense of impending danger.

Ben stands near the ventilation grill, his hands still dusty from attempting to pry it open with his penknife. He listens intently as Barclay sketches the sabotage plan on a pad of paper, his posture shifting from frustration to focused determination. Ben interjects with practical questions—'But I might,' 'Well, I've got this knife'—demonstrating his resourcefulness and willingness to take physical risks. His urgency is palpable, especially when Barclay mentions the Cybermen’s arrival, as he prepares to execute the plan by crawling through the ventilation shaft.

Goals in this moment
  • Execute the sabotage plan by crawling through the ventilation shaft to disable the rocket’s fuel pump.
  • Ensure the group’s safety by acting swiftly before the Cybermen breach the base.
Active beliefs
  • The sabotage is the only viable way to stop the rocket and prevent global catastrophe.
  • His physical agility and improvisational skills are critical to the plan’s success.
Character traits
Resourceful Pragmatic Physically courageous Quick-thinking under pressure Protective of the group’s mission
Follow Ben Jackson's journey

Focused and determined, with a quiet intensity. She is fully invested in the plan’s success, though the klaxon’s interruption introduces a sense of urgency and heightened stakes.

Polly enters the bunk room with a sense of purpose, immediately checking on the Doctor’s condition before turning her attention to the sabotage plan. She stands close to Ben and Barclay, leaning in as Barclay sketches the diagram, her expression a mix of concentration and resolve. While she doesn’t speak during this segment, her presence is supportive and proactive, reinforcing the group’s unity. Her body language suggests she is mentally preparing to assist in distracting guards or otherwise facilitating Ben’s mission.

Goals in this moment
  • Support Ben and Barclay in executing the sabotage plan, potentially by creating distractions or assisting with logistics.
  • Ensure the group remains united and coordinated amid the escalating threat.
Active beliefs
  • The sabotage is morally necessary to prevent Cutler’s reckless destruction of Mondas and the potential doom of Earth.
  • Her role, even if indirect, is crucial to the mission’s success.
Character traits
Supportive and collaborative Quick to adapt to high-pressure situations Empathetic toward the group’s collective goal Strategic thinker
Follow Polly Wright's journey

Tense and conflicted, oscillating between professional detachment and moral urgency. His initial reluctance gives way to a sense of resolve as he realizes the sabotage is the only viable option, though the klaxon’s interruption underscores the immediacy of the threat.

Barclay enters the bunk room with a reluctant demeanor, initially dismissive of tampering with the rocket. However, as the conversation progresses, he becomes increasingly engaged, sketching a detailed diagram of the ventilation shaft and fuel pump sabotage on a pad of paper. His technical expertise is evident as he explains the precise steps—unscrewing the panel, snipping the pin, and reseating the plug—though his voice grows more urgent as the klaxon blares. Barclay’s body language shifts from hesitation to focused intensity, reflecting his internal conflict between duty to the base and the moral imperative to stop the rocket.

Goals in this moment
  • Provide a technically feasible plan to sabotage the rocket’s fuel pump, ensuring it fails at launch without immediate detection.
  • Mitigate the moral and existential consequences of Cutler’s order to destroy Mondas, even if it means defying direct commands.
Active beliefs
  • The sabotage plan is the only way to prevent a catastrophic chain reaction that could doom Earth.
  • His expertise and insider knowledge of the base’s design make him uniquely positioned to facilitate the plan.
Character traits
Technically precise Initially reluctant but ultimately decisive Pragmatic under pressure Conflict between institutional loyalty and moral urgency Expertise-driven leadership
Follow The Second …'s journey
Supporting 3

Neutral and focused on his duties, unaware of the impending sabotage or the Cybermen threat. His presence adds a layer of technical and logistical risk to the plan.

The unnamed engineer is referenced as being inside the rocket silo, checking instruments and performing routine checks. His presence is noted as an additional risk to Ben’s sabotage mission, as he could potentially detect Ben’s intrusion or the tampering with the fuel pump. While not physically present in the bunk room, his role is implied as a critical factor in the plan’s execution and the group’s ability to distract him.

Goals in this moment
  • Ensure the rocket’s systems are functioning correctly prior to launch.
  • Follow standard operational procedures without deviation.
Active beliefs
  • His role is to maintain the integrity of the rocket’s systems and report any anomalies to his superiors.
  • The launch is a high-stakes operation that requires meticulous attention to detail.
Character traits
Diligent and routine-focused Technically competent Unwitting obstacle to the sabotage
Follow Barclay's journey

None (as Cybermen lack emotions), but their presence induces a sense of dread and urgency in the human characters. The klaxon’s blare serves as a visceral reminder of their impending breach and the high stakes of the sabotage.

The Cybermen are not physically present in the bunk room but are referenced as an imminent, looming threat. Their arrival is signaled by the sudden blare of the klaxon, which interrupts Barclay’s instructions and shifts the group’s focus from planning to urgent action. The Cybermen’s presence is felt through the alarm, symbolizing the escalating danger and the ticking clock for the sabotage mission.

Goals in this moment
  • Infiltrate and conquer Snowcap Base to drain Earth’s energy resources.
  • Eliminate any resistance to their invasion, including the group’s sabotage efforts.
Active beliefs
  • Human life is expendable in the pursuit of their survival and expansion.
  • Resistance to their plans is inefficient and must be neutralized.
Character traits
Relentless and mechanized Existential threat to humanity Disruptive force accelerating the group’s urgency
Follow Cybermen (Collective)'s journey

Neutral and professional, unaware of the group’s sabotage plans. His presence is a passive but critical factor in the tension of the scene.

The unnamed guard is mentioned as a stationary obstacle outside the rocket silo, his presence implied rather than directly depicted. His role is to maintain security and prevent unauthorized access, though he is not physically present in the bunk room during this event. The guard’s existence is referenced as a potential barrier to Ben’s sabotage mission, adding an additional layer of risk to the plan.

Goals in this moment
  • Maintain security protocols around the rocket silo.
  • Prevent any unauthorized personnel from accessing restricted areas.
Active beliefs
  • His role is to follow orders and uphold the base’s security protocols without question.
  • The rocket launch is a critical military operation that must proceed without interference.
Character traits
Duty-bound Precision-oriented Unwitting obstacle to the group’s goals
Follow Snowcap Base …'s journey

Objects Involved

Significant items in this scene

7
Barclay's Pad of Paper (Servo Plug Diagram)

Barclay’s pad of paper serves as the planning tool for the sabotage mission, where he sketches a precise diagram of the rocket’s fuel pump layout and the path through the ventilation shaft. The pad’s blank surface is transformed into a tactical blueprint, marking the servo plug panel’s location, the route Ben must take, and the steps he must follow to snip the pin. The diagram’s clarity and precision cut through Barclay’s initial reluctance, fueling the group’s urgent determination. The pad symbolizes the fusion of technical expertise and desperate improvisation, a tangible artifact of the group’s collaboration under pressure.

Before: Blank or used for mundane notes, lying unused …
After: Covered in a detailed diagram of the sabotage …
Before: Blank or used for mundane notes, lying unused on the bunk room table.
After: Covered in a detailed diagram of the sabotage plan, now a critical reference for Ben’s mission.
Ben's Penknife

Ben’s penknife is initially used in a failed attempt to pry open the ventilation grill, its blade scraping against unyielding metal as he twists and jabs in frustration. Though the knife ultimately proves ineffective for this task, it is repurposed as an improvised tool for the sabotage plan. Barclay confirms that the knife’s blade is sufficient to unscrew the Plug Servo Leads panel and snip the critical pin inside the servo plug, making it a pivotal object in the group’s desperate gambit. The knife symbolizes Ben’s resourcefulness and the group’s improvisational spirit in the face of overwhelming odds.

Before: Possessed by Ben, carried in his pocket, and …
After: Repurposed as the primary tool for unscrewing the …
Before: Possessed by Ben, carried in his pocket, and initially used (unsuccessfully) to open the ventilation grill.
After: Repurposed as the primary tool for unscrewing the Plug Servo Leads panel and snipping the pin, now central to the sabotage plan’s execution.
Pin in Rocket Servo Plug

The pin inside the rocket’s servo plug is the critical, delicate component that Ben must snip to disable the fuel pump. Barclay specifies that removing any one of the four small plugs and snipping its pin will cause the fuel pump pressure to fall to zero at blast-off, ensuring the rocket’s engines fail silently. The pin’s small size and precise function make it a symbol of the sabotage plan’s technical elegance—minimal intervention with maximal impact. Its destruction is the linchpin of the entire mission, representing the group’s last hope to prevent catastrophe.

Before: Intact and functional within the servo plug, ensuring …
After: Slated for snipping by Ben, its destruction will …
Before: Intact and functional within the servo plug, ensuring the fuel pump operates at full pressure.
After: Slated for snipping by Ben, its destruction will cause the fuel pump to fail at launch, grounding the rocket.
Rocket Fuel Pump Servo Leads Panel (with Plugs)

The Plug Servo Leads panel is the target of Ben’s sabotage mission, a small but critical component of the rocket’s fuel pump system. Barclay identifies it as a marked panel on the side of the rocket, just level with the walkway, which houses four small plugs shielding delicate pins in the servo leads. The panel’s tampering—unscrewing it, removing a plug, snipping a pin, and reseating the plug—is designed to cause the fuel pump pressure to drop to zero at blast-off, ensuring the rocket’s engines fail without immediate detection. The panel’s technical precision contrasts with the high-stakes desperation of the mission, embodying the intersection of human ingenuity and mechanical vulnerability.

Before: Securely fastened to the rocket’s fuel pump, undamaged …
After: Marked for sabotage, with one of its pins …
Before: Securely fastened to the rocket’s fuel pump, undamaged and functional, with all four plugs intact.
After: Marked for sabotage, with one of its pins slated to be snipped by Ben, rendering the fuel pump inoperable at launch.
Rocket Silo Ventilation Shaft

The ventilation shaft is the hidden, narrow passage that serves as the primary access route for Ben’s sabotage mission. Barclay reveals its existence as a tightly squeezed but overlooked path leading directly from the bunk room to the rocket silo. The shaft’s cramped dimensions and shielded design make it the ideal route for bypassing guards and engineers, though the risk of detection remains high. The shaft’s role is both practical—a means of infiltration—and symbolic, representing the group’s ability to exploit hidden vulnerabilities in the base’s infrastructure to thwart Cutler’s reckless plan.

Before: Unnoticed and unused, serving as a standard ventilation …
After: Identified as the critical access route for Ben’s …
Before: Unnoticed and unused, serving as a standard ventilation duct within the base’s infrastructure.
After: Identified as the critical access route for Ben’s crawl to the rocket silo, now central to the sabotage plan’s feasibility.
Snowcap Bunk Room Klaxon Alarm

The klaxon’s sudden, wailing blare interrupts Barclay’s instructions, signaling the Cybermen’s breach of the base. Its harsh sound cuts through the tense dialogue, jolting the group into a state of heightened urgency. The klaxon serves as an auditory manifestation of the Cybermen’s threat, accelerating the group’s timeline and shifting their focus from covert planning to immediate action. Its role is both practical—a warning system—and symbolic, representing the inescapable looming danger that forces the group to act without further delay.

Before: Silent, part of the base’s alarm system, awaiting …
After: Activated, blaring loudly, signaling the Cybermen’s arrival and …
Before: Silent, part of the base’s alarm system, awaiting activation.
After: Activated, blaring loudly, signaling the Cybermen’s arrival and forcing the group to abandon the sabotage briefing.
Ventilation Shaft Ladder (Bunk Room → Rocket Silo)

The ventilation grill is the initial focus of Ben’s attempts to escape the bunk room, serving as a potential entry point to the ventilation shaft. Though his penknife fails to open it, the grill’s existence sparks the group’s realization that the shaft itself could provide access to the rocket silo. Barclay confirms that the shaft leads directly into the silo, making it the critical access route for Ben’s sabotage mission. The grill’s overlooked presence becomes the linchpin of the plan, symbolizing both the group’s desperation and the hidden vulnerabilities in the base’s security.

Before: Securely fastened to the bunk room wall, initially …
After: Recognized as the entry point for Ben’s crawl …
Before: Securely fastened to the bunk room wall, initially blocking access to the ventilation shaft.
After: Recognized as the entry point for Ben’s crawl through the shaft, now a vital component of the sabotage plan.

Location Details

Places and their significance in this event

3
Bunk Room

The bunk room serves as the cramped, tension-charged epicenter of the sabotage plan’s conception. Its metal bunks and dim lighting create an oppressive atmosphere, amplifying the group’s urgency and desperation. The room’s confined space forces the characters into close proximity, fostering a sense of intimacy and shared stakes as they huddle around Barclay’s diagram. The bunk room’s role is multifunctional: a refuge for the incapacitated Doctor, a planning hub for the sabotage mission, and a symbolic space of moral and existential reckoning. The room’s atmosphere is thick with the hum of base ventilation and the faint scent of antiseptic, underscoring the high stakes of the mission and the group’s dwindling time.

Atmosphere Tension-filled with whispered conversations, the air thick with urgency and the faint hum of base …
Function Meeting point for secret negotiations and planning, refuge for the incapacitated Doctor, and symbolic space …
Symbolism Represents the group’s last bastion of agency and collaboration before facing the external threats of …
Access Restricted to the group and the Doctor; guards are stationed outside, though the bunk room …
Metal bunks stacked tightly against bare walls Dim lighting casting long shadows Faint hum of base ventilation Blankets pulled over the Doctor’s bunk for concealment
Polar Base Ventilation Shaft

The ventilation shaft is the narrow, hidden passage that serves as the critical access route for Ben’s sabotage mission. Though not physically depicted in this event, its existence is revealed by Barclay as a tightly squeezed but overlooked path leading directly from the bunk room to the rocket silo. The shaft’s cramped dimensions and shielded design make it the ideal route for bypassing guards and engineers, though the risk of detection remains high. The shaft’s role is both practical—a means of infiltration—and symbolic, representing the group’s ability to exploit hidden vulnerabilities in the base’s infrastructure to thwart Cutler’s plan. Its mention in the dialogue creates a sense of claustrophobic urgency, as Ben prepares to crawl through its confines.

Atmosphere Claustrophobic and isolating, with cold metal walls pressing close and amplifying every rustle and breath. …
Function Hidden access route for Ben’s infiltration of the rocket silo, bypassing main security checkpoints. Serves …
Symbolism Represents the group’s ability to navigate the unseen and exploited spaces within institutional structures, contrasting …
Access Unmonitored and overlooked, though physically challenging to navigate due to its tight dimensions.
Narrow, cramped metal walls Cold draft from ventilation Distant hum of machinery Faint echoes of footsteps or clanking metal
Rocket Silo (Zee-Bomb Launch Chamber)

The rocket silo is the ultimate target of the sabotage mission, a stark and humming chamber where the Zee-bomb is primed for launch. Though not physically present in this event, the silo looms large in the group’s discussions, its harsh overhead lights and echoing concrete walls symbolizing the cold, mechanical precision of Cutler’s plan. The silo’s role is both practical—a high-security area housing the rocket—and symbolic, representing the institutional power and reckless ambition that the group seeks to thwart. The mention of guards and engineers inside the silo adds a layer of risk to Ben’s mission, as he must navigate past these obstacles to reach the Plug Servo Leads panel.

Atmosphere Sterile and oppressive, with harsh overhead lights casting long shadows across metal grating and concrete. …
Function High-security launch site for the Zee-bomb, housing the rocket and its critical systems. Serves as …
Symbolism Embodies the institutional power and cold logic of military authority, contrasting with the group’s desperate, …
Access Heavily guarded, with constant surveillance by both military personnel and engineers. Access is restricted to …
Harsh overhead lights Echoing concrete walls Humming servos and machinery Metal grating walkways Guards patrolling the perimeter

Organizations Involved

Institutional presence and influence

3
Snowcap Base Staff

Snowcap Base Staff are represented indirectly in this event through the presence of guards, engineers, and the institutional protocols they uphold. While not physically present in the bunk room, their role is critical to the group’s sabotage plan, as they serve as obstacles to Ben’s infiltration of the rocket silo. The staff’s adherence to security protocols and operational procedures creates a sense of institutional rigidity, contrasting with the group’s improvisational and morally driven resistance. Their collective actions—patrolling, checking instruments, and maintaining the base’s security—embody the broader organizational dynamics that the group seeks to undermine.

Representation Via institutional protocol being followed (e.g., security patrols, instrument checks, adherence to launch procedures).
Power Dynamics Exercising authority over individuals through security measures and operational protocols, though unwittingly facilitating the group’s …
Impact The staff’s actions reinforce the base’s militarized environment, creating both obstacles and overlooked vulnerabilities for …
Internal Dynamics Hierarchical and rule-bound, with a focus on following orders and maintaining the chain of command. …
Maintain security and operational integrity around the rocket silo to ensure the Zee-bomb launch proceeds as planned. Follow General Cutler’s orders without question, even in the face of external threats like the Cybermen. Security patrols and access restrictions Operational protocols and routine checks Institutional loyalty to command structure
Cybermen

The Cybermen are represented in this event through the sudden blare of the klaxon, signaling their breach of the base. Though not physically present in the bunk room, their looming threat accelerates the group’s urgency and shifts their focus from planning to immediate action. The Cybermen’s presence is felt through the alarm, symbolizing the escalating danger and the ticking clock for the sabotage mission. Their organizational role is that of an existential threat, driving the group’s desperation and the high stakes of their plan. The klaxon’s interruption serves as a visceral reminder of the Cybermen’s relentless advance and the group’s dwindling time to act.

Representation Through the activation of the base’s alarm system (klaxon), signaling their imminent breach.
Power Dynamics Exerting overwhelming external pressure on the base and its personnel, forcing the group to act …
Impact The Cybermen’s threat amplifies the group’s sense of urgency and desperation, forcing them to act …
Internal Dynamics None (as the Cybermen operate as a hive-mind collective with no internal dissent or hierarchy). …
Infiltrate and conquer Snowcap Base to drain Earth’s energy resources. Eliminate any resistance to their invasion, including the group’s sabotage efforts. Relentless mechanical advance and invasion tactics Psychological pressure through the klaxon alarm Disruption of the group’s sabotage planning and execution
General Cutler's Forces (Snowcap Base)

General Cutler’s Forces are represented indirectly in this event through the mention of guards, engineers, and the institutional protocols they enforce. While Cutler himself is not present, his authority is felt through the base’s security measures, the rocket’s launch preparations, and the group’s need to sabotage the mission. The forces’ role is to uphold Cutler’s orders and ensure the Zee-bomb launch proceeds without interference, creating obstacles for the group’s plan. Their presence underscores the tension between institutional duty and moral urgency, as the group seeks to defy Cutler’s reckless ambitions.

Representation Through the actions of guards, engineers, and the enforcement of security protocols under Cutler’s command.
Power Dynamics Exercising authority over the base and its personnel, though their actions are unwittingly facilitating the …
Impact The forces’ actions reinforce the base’s militarized environment, creating both obstacles and overlooked vulnerabilities for …
Internal Dynamics Hierarchical and rule-bound, with a focus on following Cutler’s orders without question. Internal tensions may …
Ensure the Zee-bomb launch proceeds as ordered by General Cutler, despite the Cybermen threat. Maintain security and operational integrity around the rocket silo to prevent sabotage. Security patrols and access restrictions Operational protocols and routine checks Institutional loyalty to Cutler’s command

Narrative Connections

How this event relates to others in the story

What led here 8

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Cybermen breach aborts sabotage plan
S4E7 · The Tenth Planet Part 3

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Barclay reveals sabotage plan through ventilation shaft
S4E7 · The Tenth Planet Part 3

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Barclay reveals the ventilation shaft escape
S4E7 · The Tenth Planet Part 3

"Polly and Barclay plot sabotoge and find a way that it is technically possible."

Polly forces Barclay to sabotage the rocket
S4E7 · The Tenth Planet Part 3

"Polly and Barclay plot sabotoge and find a way that it is technically possible."

Cutler’s dual gambit against Cybermen
S4E7 · The Tenth Planet Part 3

"Polly and Barclay plot sabotoge and find a way that it is technically possible."

Polly exploits Barclay’s guilt to sabotage
S4E7 · The Tenth Planet Part 3
Temporal medium

"Polly leaves Cutler to hatch a plan to hatch a plan with Ben and Barclay to sabotage the system."

Polly and Ben Exploit Barclay’s Fear
S4E7 · The Tenth Planet Part 3
Temporal medium

"Polly leaves Cutler to hatch a plan to hatch a plan with Ben and Barclay to sabotage the system."

Cutler Overrides Warnings to Launch Zee-Bomb
S4E7 · The Tenth Planet Part 3
What this causes 4

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Barclay reveals sabotage plan through ventilation shaft
S4E7 · The Tenth Planet Part 3

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Barclay reveals the ventilation shaft escape
S4E7 · The Tenth Planet Part 3

"Polly and Ben learn they can immobilize the rocket and Barclay reveals key information about the ventilation shaft."

Cybermen breach aborts sabotage plan
S4E7 · The Tenth Planet Part 3
Temporal medium

"The warning sounds signal that the Cybermen are coming so Ben heads out utilizing the plan from Barclay."

Ben infiltrates the silo alone
S4E7 · The Tenth Planet Part 3

Key Dialogue

"BARCLAY: Along the side of the rocket, just level with the walkway, there is a panel marked Plug Servo Leads. You'll need a screwdriver."
"BEN: What'll that do?"
"BARCLAY: The fuel pump pressure will fall to zero at blast off."
"BARCLAY: (A klaxon sounds.) The Cybermen. Now look, this is what you have to do. You come out of the ventilation shaft, down a ladder at the side."