Cybermen breach the dome

The Cybermen escalate their attack on the moonbase by exploiting their pre-existing infiltration, violently rupturing the dome’s integrity and triggering a catastrophic loss of atmosphere. Hobson’s desperate attempts to reason with the Cyberman-controlled Evans fail, and the Cyberleader’s ultimatum—open the airlock or face destruction—goes unheeded. The Cybermen’s response is immediate and brutal: they puncture the dome, causing a sudden decompression that forces the crew to scramble for oxygen masks. The scene shifts from tense negotiation to frantic survival as the crew realizes the Cybermen are already inside the base, turning the conflict from external to internal. The breach not only threatens the immediate survival of the crew but also accelerates the Cybermen’s plan to sabotage Earth’s climate, raising the stakes for the Doctor and his companions to act decisively. The moment underscores the Cybermen’s ruthless efficiency and the moonbase’s vulnerability, while Hobson’s defiance—'We're not done yet and we'll fight you to the last man'—sets the tone for the crew’s desperate resistance.

Plot Beats

The narrative micro-steps within this event

1

Hobson defiantly refuses the Cybermen's demands, declaring they will fight to the last man, but the Cybermen reveal they are already inside. Suddenly, the dome is punctured, causing a rapid loss of air and forcing the crew to grab oxygen masks.

defiance to panic

Who Was There

Characters present in this moment

8

Righteously indignant with a steely resolve, masking the urgency of the moment with calculated authority.

Hobson stands defiant as the Cyberleader’s ultimatum is issued, his voice steady despite the escalating threat. When the dome is breached, he immediately shouts orders to the crew, prioritizing survival as the air rushes out. His leadership is tested as he transitions from negotiation to crisis management, his determination to resist the Cybermen unshaken even as the control room becomes a vacuum trap.

Goals in this moment
  • Ensure the crew’s survival by securing oxygen masks and maintaining order during the breach.
  • Defy the Cybermen’s demands and protect the moonbase’s integrity, even as the situation becomes dire.
Active beliefs
  • The crew can still resist the Cybermen, even in the face of overwhelming odds.
  • Surrendering to the Cybermen would doom Earth, making defiance the only viable option.
Character traits
Defiant Quick-thinking Protective Unwavering under pressure
Follow Commander Hobson's journey

None (mechanical, devoid of emotion). Their actions are driven purely by the hive mind’s logic and objectives.

The Cyberleader issues the ultimatum to Hobson, revealing that the Cybermen are already inside the moonbase before ordering the dome breach. Their cold, mechanical voice underscores the ruthlessness of their tactics, as they escalate the conflict from negotiation to outright sabotage. The Cyberleader’s actions are a direct challenge to Hobson’s defiance, aiming to break the crew’s resistance and secure control of the moonbase.

Goals in this moment
  • Force Hobson to surrender by breaching the dome and causing catastrophic decompression.
  • Accelerate the sabotage of the gravitron to manipulate Earth’s climate and weaken human resistance.
Active beliefs
  • Human defiance is temporary and will be overcome through escalating threats and sabotage.
  • The moonbase’s systems are vulnerable and can be repurposed to serve the Cybermen’s objectives.
Character traits
Ruthless Commanding Strategic in escalation
Follow Cyberleader's journey

None (mechanical, devoid of emotion). Their actions are driven purely by logic and the hive mind’s objectives.

The Cybermen, already infiltrated within the moonbase, execute the Cyberleader’s order to breach the dome, causing catastrophic decompression. Their mechanical efficiency is evident as they puncture the dome without hesitation, forcing the crew into a desperate scramble for survival. Their actions are a calculated move to weaken the crew’s resistance and accelerate their plan to sabotage Earth’s climate.

Goals in this moment
  • Force the crew into a state of desperation by breaching the dome and causing decompression.
  • Accelerate their plan to sabotage the gravitron and manipulate Earth’s climate.
Active beliefs
  • Human resistance is futile, and the crew will eventually surrender or be eliminated.
  • The breach will weaken the crew’s ability to counter their sabotage of the gravitron.
Character traits
Ruthless Mechanically efficient Unemotional in execution
Follow Cybermen (Collective)'s journey

Urgent and concerned, driven by the need to ensure the crew’s survival and maintain control of the situation.

Benoit is the first to recognize the gravity of the situation, shouting orders to the crew to grab oxygen masks as the dome is breached. His technical expertise and leadership are evident as he directs the crew’s response, ensuring they are prepared to survive the decompression. His urgency underscores the immediate threat and the need for swift action.

Goals in this moment
  • Direct the crew to secure oxygen masks and survive the decompression.
  • Assess the damage to the moonbase systems and devise a plan to counter the Cybermen’s attack.
Active beliefs
  • The crew’s survival depends on their ability to act quickly and decisively in the face of the breach.
  • There may still be a way to repurpose the moonbase’s systems to fight back against the Cybermen.
Character traits
Quick-thinking Authoritative in crises Protective of the crew
Follow Roger Benoit's journey
Supporting 4

Urgent and focused, driven by the need to secure survival equipment and support the crew in the face of the sudden threat.

Ben, like Jamie and Nils, scrambles to grab an oxygen mask as the dome is breached. His naval background likely informs his disciplined response to the crisis, ensuring he is ready to act decisively. His presence is implied by Benoit’s directive, placing him in the heart of the action as the crew fights for survival.

Goals in this moment
  • Secure an oxygen mask to survive the decompression and continue aiding the crew.
  • Assist in any way possible to stabilize the situation and counter the Cybermen’s attack.
Active beliefs
  • The crew’s unity and quick thinking are critical to overcoming the Cybermen’s sabotage.
  • There may still be a way to turn the tide, even in the midst of chaos.
Character traits
Disciplined Quick to act in emergencies Protective of the crew
Follow Ben Jackson's journey

Urgent and determined, driven by the need to survive and protect those around him in the face of the sudden threat.

Jamie, along with Nils and Ben, scrambles to grab an oxygen mask from the ceiling as the dome is breached. His actions are implied by Benoit’s directive, placing him in the thick of the chaos as the crew fights for survival. His loyalty to the group is evident in his immediate response to the crisis, ensuring he and his companions are not left vulnerable.

Goals in this moment
  • Secure an oxygen mask to survive the decompression and continue fighting alongside the crew.
  • Stay close to the Doctor and Polly to ensure their safety in the chaotic moment.
Active beliefs
  • The Cybermen’s attack is a cowardly tactic, and the crew must outsmart them to survive.
  • Sticking together is the key to overcoming this crisis.
Character traits
Loyal Quick to act in emergencies Protective of companions
Follow Jamie McCrimmon's journey

Focused and urgent, driven by the need to secure survival equipment and support the crew in the moment of crisis.

Nils, alongside Ben and Jamie, rushes to grab an oxygen mask as the dome is breached. His role in the scene is implied by Benoit’s directive, positioning him as an active participant in the crew’s desperate scramble for survival. His technical background likely informs his quick response to the crisis, ensuring he is prepared to act under pressure.

Goals in this moment
  • Secure an oxygen mask to survive the decompression and continue aiding the crew.
  • Assist in any way possible to stabilize the situation and counter the Cybermen’s attack.
Active beliefs
  • The crew’s coordinated response is essential to surviving the breach and regaining control of the moonbase.
  • Technical solutions may still be found to mitigate the damage caused by the Cybermen.
Character traits
Quick-thinking Resourceful under pressure Team-oriented
Follow Nils's journey

Focused and alert, prioritizing immediate survival while likely assessing the broader implications of the breach for the mission.

The Doctor is at the console when the dome breach occurs, quickly grabbing an oxygen mask to survive the decompression. His presence is implied in Benoit’s directive to the crew, suggesting he is actively engaged in the chaos, though his specific actions are not detailed beyond securing his own survival in the moment.

Goals in this moment
  • Survive the decompression to continue aiding the crew against the Cybermen.
  • Assess the damage to the gravitron and moonbase systems to devise a countermeasure.
Active beliefs
  • The Cybermen’s breach is a calculated move to force surrender, but the crew’s resilience can still turn the tide.
  • The gravitron’s systems may yet be repurposed to counter the Cybermen’s sabotage.
Character traits
Resourceful Protective of companions Adaptable in crises
Follow The Second …'s journey

Objects Involved

Significant items in this scene

4
Moonbase Airlock Outer Doors (Armored Entry System)

The Moonbase Airlock Outer Doors are referenced in the Cyberleader’s ultimatum, where they demand Hobson open them to allow the Cybermen entry. Hobson’s defiance—'You'll never get inside this base'—directly challenges the Cybermen’s authority, leading to the dome breach as a retaliatory measure. The airlock becomes a symbolic and strategic point of contention, representing the crew’s last line of defense before the Cybermen’s physical infiltration. Its mention in the ultimatum highlights the tension between the crew’s resistance and the Cybermen’s relentless advance.

Before: Sealed and secured, with Hobson refusing to open …
After: Still sealed, but the dome breach renders the …
Before: Sealed and secured, with Hobson refusing to open them to the Cybermen.
After: Still sealed, but the dome breach renders the airlock’s significance secondary to the immediate threat of decompression. The crew’s focus shifts to survival, leaving the airlock as a secondary concern in the chaos.
Moonbase Alpha Gravitron Control Console (with Digital Counter)

The Moonbase Control Room Gravitron Console is central to the Cybermen’s sabotage, as Evans—under their control—manipulates its systems to align with spring tides, threatening to flood half of Europe. While the console itself is not directly involved in the dome breach, its compromised state underscores the urgency of the crew’s situation. The breach forces the crew to prioritize survival over regaining control of the gravitron, accelerating the Cybermen’s plan to manipulate Earth’s climate.

Before: Functioning but compromised, with Evans (under Cyberman control) …
After: Still compromised, but the immediate focus shifts to …
Before: Functioning but compromised, with Evans (under Cyberman control) manipulating its settings to align with spring tides, posing a direct threat to Earth’s climate.
After: Still compromised, but the immediate focus shifts to survival as the crew scrambles for oxygen masks. The gravitron remains a critical vulnerability, now overshadowed by the need to address the dome breach and decompression.
Moonbase Control Room Atmospheric Dome

The Moonbase Control Room Dome is violently breached by the Cybermen in retaliation for Hobson’s defiance, causing catastrophic decompression. The breach is sudden and brutal, forcing the crew to scramble for oxygen masks as the air rushes out. The dome’s failure transforms the control room from a hub of command into a battleground for survival, with the crew’s actions now dictated by the need to breathe. The breach also accelerates the Cybermen’s plan to sabotage Earth’s climate, as the crew’s focus shifts from negotiation to desperation.

Before: Intact but vulnerable, with the Cybermen already infiltrated …
After: Breached and decompressed, with the crew relying on …
Before: Intact but vulnerable, with the Cybermen already infiltrated within the moonbase.
After: Breached and decompressed, with the crew relying on oxygen masks to survive. The dome’s failure is a critical turning point, escalating the conflict and raising the stakes for the crew’s survival.
Moonbase Control Room Oxygen Masks

The Moonbase Crew’s Oxygen Masks become the crew’s lifeline as the dome is breached, causing catastrophic decompression. Benoit’s urgent directive to grab the masks—hanging from the ceiling—triggers a frantic scramble among the crew, including Nils, Ben, Jamie, and the Doctor. The masks are standard moonbase safety equipment, but their sudden necessity underscores the dire situation and the crew’s desperate fight for survival. Without them, the crew would succumb to the vacuum in minutes.

Before: Hanging from ceiling panels, ready for emergency use …
After: Deployed and in use by the crew, ensuring …
Before: Hanging from ceiling panels, ready for emergency use but not yet deployed.
After: Deployed and in use by the crew, ensuring their survival in the decompressed control room. The masks are now critical tools in the crew’s ongoing struggle against the Cybermen.

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 conflict, shifting from a tense negotiation hub to a battleground for survival as the dome is breached. The room, once a symbol of human command and control, becomes a vacuum trap, forcing the crew to scramble for oxygen masks. The breach accelerates the Cybermen’s plan to sabotage Earth’s climate, as the crew’s focus shifts from regaining control of the gravitron to ensuring their immediate survival. The control room’s atmosphere is one of chaos and urgency, with the crew’s actions dictated by the need to breathe and the looming threat of total annihilation.

Atmosphere Chaotic and urgent, with the crew scrambling for survival as the air rushes out. The …
Function Battleground for survival and a hub of desperate resistance against the Cybermen’s sabotage.
Symbolism Represents the fragility of human control and the sudden escalation of the conflict from negotiation …
Access Restricted to the crew and Cybermen, with the breach exposing the room to the vacuum …
Decompression alarms blaring as the air rushes out. Oxygen masks dangling from ceiling panels, grabbed in a frantic scramble. The gravitron console humming ominously in the background, a reminder of the Cybermen’s sabotage.

Organizations Involved

Institutional presence and influence

2
Cybermen

The Cybermen, as an organization, execute a ruthless and calculated escalation of their attack on the moonbase. Their hive-minded collective action—breaching the dome to cause catastrophic decompression—demonstrates their efficiency and lack of emotional constraint. The breach is a direct response to Hobson’s defiance, aiming to weaken the crew’s resistance and accelerate their plan to sabotage Earth’s climate. The Cybermen’s actions are a testament to their strategic adaptability and their willingness to employ brutal tactics to achieve their objectives.

Representation Through direct action (breaching the dome) and mechanical efficiency (executing the Cyberleader’s orders without hesitation).
Power Dynamics Exercising overwhelming authority over the moonbase crew, leveraging their infiltration and technological superiority to force …
Impact The breach underscores the Cybermen’s ability to exploit human vulnerabilities, using the moonbase’s structural weaknesses …
Internal Dynamics The Cybermen operate as a unified hive mind, with the Cyberleader issuing directives that are …
Force the crew into a state of desperation by breaching the dome and causing decompression. Accelerate the sabotage of the gravitron to manipulate Earth’s climate and weaken human resistance. Brutal tactical escalation (dome breach to cause decompression). Psychological pressure (issuing ultimatums and revealing infiltration).
Moonbase Human Crew

The Moonbase Crew, led by Hobson, demonstrates resilience and quick thinking in the face of the Cybermen’s breach. Their coordinated response—grabbing oxygen masks and prioritizing survival—highlights their unity and adaptability under pressure. Despite the dire situation, the crew’s defiance remains unbroken, with Hobson vowing to fight to the last man. Their actions reflect a deeper commitment to protecting Earth, even as their own survival hangs in the balance. The breach tests their loyalty, resourcefulness, and willingness to resist the Cybermen’s domination.

Representation Through collective action (grabbing oxygen masks, following Hobson’s orders) and institutional protocol (prioritizing survival and …
Power Dynamics Operating under constraint, with the crew’s authority challenged by the Cybermen’s infiltration and sabotage. Their …
Impact The crew’s response to the breach reflects their commitment to their mission, even in the …
Internal Dynamics The crew operates as a tight-knit unit, with Hobson’s leadership guiding their actions. There is …
Secure oxygen masks to survive the decompression and continue resisting the Cybermen. Regain control of the gravitron to counter the Cybermen’s sabotage and protect Earth’s climate. Unity and quick thinking (coordinated response to the breach). Loyalty to Hobson’s leadership and the mission to protect Earth.

Narrative Connections

How this event relates to others in the story

What led here 5

"Hobson's refusal to the Cyberman ultimatum directly leads to the Cybermen puncturing the dome, causing a loss of air and escalating the crisis significantly."

Hobson’s final refusal to Cybermen
S4E26 · The Moonbase Part 4

"Doctor realizes that Evans is under Cybermen control and later on Hobson attempts to reason with a changed/modified person, but fails because is not the same person because Cybermen control."

Relief ship diverted to the sun
S4E26 · The Moonbase Part 4

"Doctor realizes that Evans is under Cybermen control and later on Hobson attempts to reason with a changed/modified person, but fails because is not the same person because Cybermen control."

Doctor uncovers Cyberman sabotage and orders quarantine
S4E26 · The Moonbase Part 4

"Ben directs Jamie to reinforce medical room which is then followed by Hobson attempting to reason with Evans. Demonstrating threat is still a current issue."

Barricading Against Cyber-Controlled Crew
S4E26 · The Moonbase Part 4

"Hobson's failed attempt to reason with Evans is followed by him deciding that they must remove them, followed by the threat made by the Evans/Cybermen, heightening the stakes."

Hobson’s final refusal to Cybermen
S4E26 · The Moonbase Part 4
What this causes 3

"Hobson's refusal to the Cyberman ultimatum directly leads to the Cybermen puncturing the dome, causing a loss of air and escalating the crisis significantly."

Hobson’s final refusal to Cybermen
S4E26 · The Moonbase Part 4

"Hobson's failed attempt to reason with Evans is followed by him deciding that they must remove them, followed by the threat made by the Evans/Cybermen, heightening the stakes."

Hobson’s final refusal to Cybermen
S4E26 · The Moonbase Part 4

"The dome getting punctured and losing oxygen leads to Benoit expressing concerns and Hobson trying to stop it."

Dome breach forces desperate patchwork repair
S4E26 · The Moonbase Part 4

Themes This Exemplifies

Thematic resonance and meaning

Key Dialogue

"HOBSON: Evans, can you hear me? Listen, Evans, this is Hobson talking. Evans, you've got to concentrate. Your brain has been altered by the Cybermen. You're being controlled by them, anyhow. We've got one or two of those things as well, you know. You can't shoot all of us so why not be a good fellow and come out of there."
"CYBERLEADER: Resistance is useless. All further ships from Earth will be deflected. Open the airlock to us. If you do not we shall destroy the base and you will be eliminated."
"HOBSON: Well you can hear this too, then. We're not done yet and we'll fight you to the last man. You'll never get inside this base."
"CYBERLEADER: We are in it already."
"HOBSON: They've punctured the dome!"