Companions disrupt Cybermen with solvent attack

In the Control Room, Ben, Jamie, and Polly execute a high-risk ambush on the Cybermen, spraying their chest units with a solvent mixture (the 'Polly cocktail') that instantly dissolves the circuitry. The Cybermen collapse, their systems failing as their chest plates bubble and corrode. Seizing the moment, the Doctor and companions rush into the Gravitron room to remove the metal helmets from the mind-controlled humans—Evans, Franz, Ralph, and Jules—freeing them from the Cybermen's psychic control. The men collapse unconscious, their autonomy restored. Hobson, prioritizing the Gravitron's stabilization over immediate medical aid, orders the crew to move the freed men to the medical unit while he and the Doctor work to reset the device. This moment marks a critical shift in the battle, as the companions' ingenuity and bravery disrupt the Cybermen's control over the moonbase and its personnel, creating an opening for the Doctor to counter their invasion.

Plot Beats

The narrative micro-steps within this event

2

A Cyberman detects an outside presence, disrupting their plans. Ben, Jamie, and Polly then burst into the room, launching an attack on the Cybermen.

Tension to action

Ben, Jamie, and Polly dissolve the Cybermen's chest units using a solvent, causing them to collapse, while the Doctor directs them to remove the helmets from the mind-controlled humans.

Action to relief ['gravitron room']

Who Was There

Characters present in this moment

10

Determined and focused, with a sense of triumph at disrupting the Cybermen's control and freeing the mind-controlled men.

Ben leads the ambush on the Cybermen, spraying their chest units with the 'Polly cocktail' and causing them to collapse. He then assists in removing the metal helmets from the mind-controlled humans in the Gravitron room, working alongside Jamie and Polly. His actions are bold, decisive, and driven by a protective instinct for his companions and the moonbase crew.

Goals in this moment
  • Disable the Cybermen using the 'Polly cocktail'
  • Free the mind-controlled humans from Cyberman domination
Active beliefs
  • Improvised solutions can outmaneuver superior technology when creativity and teamwork are applied
  • The Cybermen's vulnerability lies in their reliance on mechanical systems, not just brute force
Character traits
Bold and decisive in action Protective of companions and allies Resourceful under pressure Collaborative with Jamie and Polly
Follow Ben Jackson's journey

Resolute and focused, with a sense of triumph at disrupting the Cybermen's control and freeing the mind-controlled men.

Polly participates in the ambush on the Cybermen, spraying their chest units with the 'Polly cocktail' and causing them to collapse. She then assists in removing the metal helmets from the mind-controlled humans in the Gravitron room. Her actions are resolute and driven by her scientific insight and protective instincts toward her companions and the moonbase crew.

Goals in this moment
  • Disable the Cybermen using the 'Polly cocktail'
  • Free the mind-controlled humans from Cyberman domination
Active beliefs
  • Science and creativity can overcome seemingly invincible technology
  • Human lives and autonomy are worth fighting for, even against overwhelming odds
Character traits
Resolute and determined in action Scientifically insightful and resourceful Protective of companions and allies Collaborative with Ben and Jamie
Follow Polly Wright's journey

Stressed but resolute, masking deep concern for his crew beneath a veneer of professional urgency.

Hobson, the moonbase commander, prioritizes the stabilization of the Gravitron over immediate medical aid for the freed men. He barks urgent orders to his crew, directing them to move the unconscious men to the medical unit while he and the Doctor work to reset the device. His leadership is characterized by a stressed but authoritative demeanor, balancing the need to secure the moonbase's critical systems with the humanitarian concern for his crew.

Goals in this moment
  • Stabilize the Gravitron to prevent catastrophic weather disruptions on Earth
  • Ensure the safety and recovery of his freed crew members
Active beliefs
  • The Gravitron's stabilization is the top priority to save Earth, even at the cost of delayed medical attention
  • His crew's loyalty and trust in his leadership are critical to the moonbase's survival
Character traits
Strategically focused under pressure Authoritative and decisive Balances operational priorities with crew welfare Resilient in crisis
Follow Commander Hobson's journey
Cyberman 1
primary

Coldly efficient, then abruptly incapacitated by systemic failure (no fear or pain, just mechanical shutdown).

Cyberman 1, the lead Cyberman in the Control Room, turns on the Doctor with mechanical precision, reporting that 'the beam is jammed'—a sign of disruption in their control systems. Moments later, he is directly targeted by the 'Polly cocktail,' which instantly dissolves his chest unit, causing him to collapse helplessly as his systems fail. His rigid, emotionless demeanor is shattered by the sudden and irreversible damage to his cybernetic form.

Goals in this moment
  • Maintain control over the moonbase crew and Gravitron
  • Eliminate resistance from the Doctor and companions
Active beliefs
  • Human emotions and improvisation are irrelevant to operational success
  • Cyberman technology is superior and invulnerable to organic countermeasures
Character traits
Mechanically precise Ruthlessly efficient Vulnerable to external sabotage Emotionally detached (until collapse)
Follow Cyberman 1's journey

Alert and operational until sudden, irreversible system failure (no emotional response, only mechanical dysfunction).

Cyberman 2 detects a high-pitched noise outside the Control Room, alerting Cyberman 1 and causing the mind-controlled men to freeze. He participates in the initial standoff with the Doctor but is quickly overwhelmed when Ben, Jamie, and Polly spray the 'Polly cocktail' at his chest unit. The solvent corrodes his circuitry, forcing him to collapse as his systems fail. His role as a subordinate enforcer is abruptly terminated by the ambush.

Goals in this moment
  • Support Cyberman 1's commands and maintain control over the mind-controlled humans
  • Detect and neutralize external threats to the Cybermen's operation
Active beliefs
  • The Cybermen's collective is invincible to organic resistance
  • Human improvisation is a minor inconvenience, not a strategic threat
Character traits
Alert to external threats Subordinate to Cyberman 1 Vulnerable to chemical attacks Mechanically reactive
Follow Cyberman 2's journey

Urgent and determined, with a mix of relief at freeing the men and deep concern for the Gravitron's destabilization.

The Doctor oversees the removal of the metal helmets from the mind-controlled humans in the Gravitron room, freeing Evans, Franz, Ralph, and Jules from Cyberman control. He then collaborates with Hobson to reset the Gravitron device, his urgency and scientific acumen driving the critical operations. His actions are a blend of compassion for the freed men and strategic necessity to counter the Cybermen's threat.

Goals in this moment
  • Free the mind-controlled humans from Cyberman domination
  • Reset the Gravitron to prevent Earth's destruction
Active beliefs
  • Human lives and autonomy are worth fighting for, even against overwhelming odds
  • The Gravitron's technology can be salvaged and repurposed to counter the Cybermen's plans
Character traits
Compassionate yet pragmatic Scientifically precise under pressure Collaborative with Hobson despite initial distrust Urgent and focused
Follow The Second …'s journey
Supporting 4

None (unconscious), but inferred relief and trauma from sudden freedom.

Jules, another mind-controlled human, has his metal helmet removed by Ben, Jamie, and Polly. Like Evans, the sudden liberation from Cyberman control causes him to collapse unconscious. His body is physically exhausted, and his mind is likely reeling from the traumatic experience of being a puppet under Cyberman domination.

Character traits
Physically and mentally exhausted post-liberation Unconscious and unresponsive Requires immediate medical care
Follow Jules Renan's journey
Evans
Doctor
secondary

None (unconscious), but inferred shock and relief from sudden freedom.

Franz, a mind-controlled human, has his metal helmet removed by Ben, Jamie, and Polly. The sudden liberation from Cyberman control causes him to collapse unconscious, his body and mind reeling from the traumatic experience. His condition is fragile, and he requires immediate medical care to stabilize and recover.

Character traits
Physically and mentally fragile post-liberation Unconscious and unresponsive Requires urgent medical attention
Follow Evans's journey

None (unconscious), but inferred trauma from forced mind-control and sudden liberation.

Evans, one of the mind-controlled humans, has a metal helmet forcibly removed by Ben, Jamie, and Polly. The sudden liberation from Cyberman control causes him to collapse unconscious, his autonomy restored but his body overwhelmed by the traumatic experience. His state is one of physical and psychological vulnerability, requiring immediate medical attention.

Character traits
Physically and mentally vulnerable post-liberation Unconscious and unresponsive Requires immediate medical care
Follow Franz's journey

None (unconscious), but inferred disorientation and relief from liberation.

Ralph, a mind-controlled human, has his metal helmet removed by Ben, Jamie, and Polly. The abrupt severing of Cyberman control causes him to collapse unconscious, his body and mind overwhelmed by the sudden return of autonomy. His condition is critical, requiring urgent medical attention to recover from the ordeal.

Character traits
Physically and psychologically overwhelmed post-liberation Unconscious and unresponsive Requires immediate medical intervention
Follow Ralph's journey

Objects Involved

Significant items in this scene

4
Cybermen Conversion Headpieces

The Cybermen's Conversion Headpieces are forcibly removed from the skulls of Evans, Franz, Ralph, and Jules by Ben, Jamie, and Polly. These devices, which clamped onto the men's bones to override their will and erase their individuality, are pried off in a swift and decisive action. The removal severs the Cybermen's psychic control, causing the men to collapse unconscious as their autonomy is restored. The headpieces, now detached, lie inert on the floor, their purpose fulfilled and their victims freed.

Before: Firmly attached to the skulls of Evans, Franz, …
After: Detached and lying inert on the floor, no …
Before: Firmly attached to the skulls of Evans, Franz, Ralph, and Jules, actively overriding their will and maintaining Cyberman control.
After: Detached and lying inert on the floor, no longer functional as control devices.
Cybermen's Chest Unit Plastic

The Cybermen's Chest Units are the primary targets of the 'Polly cocktail' ambush. Ben, Jamie, and Polly spray the solvent mixture directly at these vulnerable plastic components, causing them to bubble, corrode, and dissolve instantly. The chest units, which house the Cybermen's critical circuitry, fail catastrophically under the chemical assault, leading to the immediate collapse of Cyberman 1 and Cyberman 2. This direct attack on their mechanical vulnerability proves decisive in disrupting their control over the moonbase.

Before: Intact and functional, housing the Cybermen's critical circuitry …
After: Corroded, dissolved, and non-functional, leading to the immediate …
Before: Intact and functional, housing the Cybermen's critical circuitry and providing them with mechanical resilience.
After: Corroded, dissolved, and non-functional, leading to the immediate shutdown of the Cybermen targeted.
Gravitron

The Gravitron, the moonbase's central gravity-control device, is a critical focal point in this event. While the Doctor and Hobson work urgently to reset the Gravitron to prevent catastrophic weather disruptions on Earth, the device remains vulnerable to Cyberman manipulation. Its stabilization is prioritized over immediate medical aid for the freed men, underscoring its role as the moonbase's most critical system and the Cybermen's primary target for global destruction.

Before: Operating under Cyberman control, destabilized and on the …
After: In the process of being reset by the …
Before: Operating under Cyberman control, destabilized and on the verge of unleashing catastrophic weather disruptions on Earth.
After: In the process of being reset by the Doctor and Hobson, with its systems gradually stabilizing to prevent global destruction.
Solvent Mixture Bottle (Polly Cocktail)

The 'Polly cocktail'—a volatile solvent mixture of benzene, ether, alcohol, acetone, and epoxy-propane—is the weapon that turns the tide of the battle. Ben and Polly refilled a fire extinguisher bottle with this mixture, creating a spray weapon specifically designed to target the Cybermen's plastic chest units. During the ambush, they use the bottle to spray the solvent directly at the Cybermen, causing their chest units to bubble, corrode, and dissolve. This improvised weapon proves critical in disabling the Cybermen and freeing the mind-controlled humans.

Before: Contained within a fire extinguisher bottle, ready for …
After: Expended and empty after being sprayed at the …
Before: Contained within a fire extinguisher bottle, ready for deployment in the ambush against the Cybermen.
After: Expended and empty after being sprayed at the Cybermen, having fulfilled its purpose in disabling their chest units.

Location Details

Places and their significance in this event

3
Gravitron Control Room (Moonbase Command Hub)

The Gravitron Chamber is the secondary battleground where the Doctor and companions rush to free the mind-controlled humans. This sealed chamber houses the Gravitron, the moonbase's critical gravity-control device, and is a tight, confined space filled with flickering systems and blaring alarms. The Doctor and companions remove the metal helmets from Evans, Franz, Ralph, and Jules, freeing them from Cyberman control. The chamber's atmosphere is one of urgency and relief, as the men collapse unconscious but are finally liberated from their psychic imprisonment.

Atmosphere Urgent, confined, and filled with the sounds of flickering systems and blaring alarms, shifting to …
Function Secondary battleground for freeing the mind-controlled humans and a critical operational space for the Gravitron's …
Symbolism Represents the struggle between human autonomy and Cyberman domination, as well as the critical role …
Access Initially restricted to Cybermen and mind-controlled humans, but accessed by the Doctor and companions during …
Flickering systems and blaring alarms indicating the Gravitron's destabilized state Tight, confined space amplifying the urgency of the situation Mind-controlled humans present, creating a sense of oppression and the need for swift action
Moonbase Control Center

The Control Room serves as the primary battleground for the ambush on the Cybermen. Ben, Jamie, and Polly burst into this nerve center of the moonbase, where Cyberman 1 and Cyberman 2 are overseeing the mind-controlled humans. The room is tense and chaotic as the 'Polly cocktail' is sprayed, causing the Cybermen to collapse. The Control Room's consoles and equipment hum with activity, reflecting the urgency of the situation. It is a space of high stakes, where the fate of the moonbase and Earth hangs in the balance.

Atmosphere Tense, chaotic, and urgent, with the hum of equipment and the sudden chaos of the …
Function Battleground for the ambush on the Cybermen and a critical operational hub for moonbase control.
Symbolism Represents the heart of human resistance against the Cybermen's invasion and the pivotal point where …
Access Initially restricted to Cybermen and mind-controlled humans, but breached by Ben, Jamie, and Polly during …
Humming consoles and equipment reflecting the moonbase's operational status Tense, high-stakes atmosphere with sudden chaos during the ambush Cybermen and mind-controlled humans present, creating a sense of oppression and control
Moonbase Medical Unit

The Medical Unit is mentioned as the destination for the freed men, though it is not directly depicted in this event. Hobson orders the crew to move Evans, Franz, Ralph, and Jules to the medical unit for immediate care after they collapse unconscious. This location symbolizes safety, recovery, and the human effort to heal and restore autonomy. While not physically present in this event, its role as a refuge and healing space is critical to the narrative.

Atmosphere Not directly observed, but inferred as a calm, clinical space focused on recovery and healing.
Function Safe haven and healing space for the freed men, providing medical care and restoration of …
Symbolism Represents the human effort to restore health, dignity, and autonomy after the trauma of mind-control.
Access Restricted to medical personnel and those in need of care, but accessible to the freed …
Clinical and calm atmosphere focused on recovery Medical equipment and supplies for treating the freed men Space for rest and healing after the ordeal of mind-control

Organizations Involved

Institutional presence and influence

2
Cybermen

The Cybermen, as an organization, are directly targeted and disrupted in this event. Their collective control over the moonbase is challenged by the ambush led by Ben, Jamie, and Polly, who use the 'Polly cocktail' to dissolve the Cybermen's chest units. This attack causes Cyberman 1 and Cyberman 2 to collapse, severely weakening their operational capacity. The Cybermen's reliance on mechanical systems and their dismissal of human creativity prove to be their downfall in this critical moment.

Representation Through direct action of Cyberman 1 and Cyberman 2, who are targeted and disabled by …
Power Dynamics Initially exercising authority over the moonbase and its personnel, but challenged and disrupted by the …
Impact The ambush significantly weakens the Cybermen's control over the moonbase, creating an opening for the …
Internal Dynamics The Cybermen operate as a collective with rigid hierarchy and mechanical precision, but their vulnerability …
Maintain control over the moonbase and its personnel to weaponize the Gravitron Eliminate resistance from the Doctor and companions to ensure the success of their extinction plan Mechanical domination through Cyberman technology and mind-control devices Ruthless enforcement of orders and threats of assimilation
Moonbase Human Crew

The Moonbase Crew, represented by Hobson and the freed men, plays a critical role in this event. Hobson prioritizes the stabilization of the Gravitron over immediate medical aid, demonstrating his leadership and strategic focus. The freed men—Evans, Franz, Ralph, and Jules—are liberated from Cyberman control, collapsing unconscious but with their autonomy restored. Their recovery and the crew's efforts to move them to the medical unit highlight the human resilience and solidarity that counter the Cybermen's invasion.

Representation Through the actions of Hobson, who directs the crew, and the freed men, who are …
Power Dynamics Initially under Cyberman control, but reclaiming authority through the companions' ambush and the Doctor's intervention.
Impact The event marks a turning point in the battle for the moonbase, as the crew …
Internal Dynamics The crew operates under Hobson's authoritative leadership, with a focus on both operational priorities and …
Stabilize the Gravitron to prevent catastrophic weather disruptions on Earth Free the mind-controlled humans from Cyberman domination and restore their autonomy Human ingenuity and teamwork, as demonstrated by the 'Polly cocktail' ambush Leadership and strategic direction from Hobson and the Doctor Solidarity and resilience among the moonbase crew

Narrative Connections

How this event relates to others in the story

What led here 2

"Ben explaining the plan to infiltrate the Control Room gives the context as to why the Cybermen's plans are being disrupted."

Ben reluctantly accepts Polly’s inclusion
S4E25 · The Moonbase Part 3

"The attack from Ben, Polly and Jamie is the direct intervention and the resolution to their solvent mixture to be used."

Hobson prioritizes Gravitron over fallen crew
S4E25 · The Moonbase Part 3
What this causes 1

"The attack from Ben, Polly and Jamie is the direct intervention and the resolution to their solvent mixture to be used."

Hobson prioritizes Gravitron over fallen crew
S4E25 · The Moonbase Part 3

Themes This Exemplifies

Thematic resonance and meaning

Part of Larger Arcs

Key Dialogue

"CYBERMAN 2: Someone is there."
"BEN: Quickly, go and get their chest things!"
"DOCTOR: Quick, get these things off their heads!"
"POLLY: What about those poor men?"
"HOBSON: Shift them along to the medical unit, quick as you can."