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S20E12 · Mawdryn Undead Part 4

Doctor resolves Brigadier paradox with Turlough's help

The Doctor discovers two versions of Brigadier Lethbridge-Stewart aboard the spaceship, creating a dangerous temporal paradox. He devises a plan to send the 1983 Brigadier back to his correct timeline using the TARDIS transmat capsule, depending on Turlough to enforce the separation. Despite Turlough's reservations about the transmat's untested reliability, the Doctor reassures him of its safety and insists he keep the other Brigadier confined in the capsule until given further instruction. This moment tests the Doctor's trust in Turlough while testing temporal mechanics to their absolute limit. key_dialogue: [ DOCTOR: The two time zones. The Brigadier did go with Tegan and Nyssa. There are now two Lethbridge Stewarts on this ship. TURLOUGH: I understand. DOCTOR: Now, I will take the Brigadier in the Tardis back to 1983 Earth. TURLOUGH: And me? DOCTOR: You must find the other Brigadier and take him to the transmat capsule. You'll be quite safe, the mutants won't harm you. DOCTOR: It will. The capsule is locked into the Tardis' homing device. It will transmat to the centre of the Tardis. I wired the device myself. TURLOUGH: Of course. DOCTOR: Now, when you arrive, whatever you do, stay in the capsule. Don't let the Brigadier out until I give you the word. Now, quickly. ]

Plot Beats

The narrative micro-steps within this event

4

The Doctor informs Turlough about the problem with the Brigadier due to the two time zones causing two Lethbridge Stewarts to be on the ship.

calm to concern

The Doctor instructs Turlough to find the other Brigadier and take him to the transmat capsule while the Doctor takes one Brigadier back to 1983 Earth in the TARDIS.

concern to determination

Turlough expresses doubt about the transmat beam working, but the Doctor assures him it will because it's locked into the TARDIS' homing device.

doubt to confidence

The Doctor gives Turlough final instructions to stay in the capsule with the Brigadier until he gives the word, then hurries to execute the plan.

determination to action

Who Was There

Characters present in this moment

4

Externally composed but internally driven by urgency, balancing trust in his plan with the weight of temporal stakes

The Doctor assumes command of the crisis, explaining the temporal paradox and commanding Turlough into specific action. He projects unwavering certainty, emphasizing the transmat's safety while assigning the critical task of confining the duplicate Brigadier to Turlough. His movements and dialogue convey urgency and precision.

Goals in this moment
  • Resolve the temporal paradox by sending the 1983 Brigadier to his correct timeline
  • Ensure Turlough understands and executes his directives faithfully
Active beliefs
  • The home-made modifications to the TARDIS homing device will work as calibrated
  • Turlough is capable of obeying his instructions despite reservations
Character traits
commanding reassuring precise authoritative
Follow The Fifth …'s journey

Ambivalent, caught between skepticism and the necessity of compliance under the Doctor’s authority

Turlough receives the Doctor’s plan with initial hesitation, arguing the transmat’s unreliability but ultimately consenting after the Doctor’s reassurance. He is tasked with physically sequestering the anomalous Brigadier in the transmat capsule, reflecting a shift from resistance to reluctant compliance.

Goals in this moment
  • Follow the Doctor’s instructions despite doubts about the transmat capsule
  • Confine the duplicate Brigadier in the capsule until release signal
Active beliefs
  • The Doctor’s personal modifications should be trusted
  • Direct opposition to the Doctor risks deeper temporal consequences
Character traits
hesitant responsible compliant under pressure
Follow Turlough's journey
Supporting 2

Not applicable — not present or aware in the scene

The 1983 Brigadier exists as a physical anomaly aboard the derelict ship, a duplicate created by temporal disturbance. He is not yet active in this scene but forms the core of the paradox the Doctor and Turlough must resolve through transmat transfer.

Goals in this moment
  • Be delivered to his correct timeline in 1983 via the transmat
Active beliefs
  • Temporal anomalies will be corrected by the Doctor's actions
Character traits
absent but implied anomalous passive
Follow Brigadier Alistair …'s journey
The Mutants
secondary

Neutral but exist as an atmospheric pressure on Turlough’s actions

The Mutants remain an unseen but implied threat in the derelict ship. The Doctor explicitly states they will not harm Turlough, suggesting their presence is felt rather than seen, adding tension to Turlough’s task of hiding from them while guiding the duplicate Brigadier.

Goals in this moment
  • Not active goals — serve as background tension and narrative caution
Active beliefs
  • They adhere to the Doctor’s implied authority
Character traits
passive ambiently menacing non-interactive in this moment
Follow The Mutants's journey

Objects Involved

Significant items in this scene

3
The Doctor’s TARDIS

The Doctor’s TARDIS serves as both anchor and destination for the transmat operation. The vehicle’s internal systems are prepared to receive the capsule at its center in 1983. The TARDIS hums with temporal energy as the Doctor overrides systems to reverse the Brigadier’s paradox, acting as the stabilizing force amidst the anomaly.

Before: Stressed by temporal corrosion, harboring a secret chamber …
After: Prepared to receive and resolve the paradox via …
Before: Stressed by temporal corrosion, harboring a secret chamber where the 1977 Brigadier is concealed
After: Prepared to receive and resolve the paradox via transmat arrival of the 1983 Brigadier
Mobile Transmat Capsule (Turlough's Device)

The penknife, retrieved by the 1977 Brigadier in a secret chamber, functions as a symbol of mundane readiness amidst extraordinary chaos. Though not integral to the transmat plan, it humanizes the Brigadier and implies his instinct to prepare for the unknown using ordinary tools.

Before: Resting on a key ring in the Brigadier’s …
After: Taken out and held, possibly to cut loose …
Before: Resting on a key ring in the Brigadier’s pocket during his 1977 timeline
After: Taken out and held, possibly to cut loose or defend, but not used in this scene
Transmat-Capsule Temporal Homing Mechanism

The Brigadier's homing device is embedded in the transmat capsule’s alignment system, enabling the transmat beam to lock onto the exact center of the TARDIS in 1983. Hand-wired by the Doctor, it represents the nexus of temporal mechanics in this crisis. Its silent operation reflects the Doctor’s trust in his own craftsmanship.

Before: Dormant or malfunctioning according to Turlough's assertion, later …
After: Functioning perfectly, guiding the capsule to the TARDIS …
Before: Dormant or malfunctioning according to Turlough's assertion, later validated as functional by the Doctor
After: Functioning perfectly, guiding the capsule to the TARDIS center

Location Details

Places and their significance in this event

1
Abandoned Luxury Spaceship Bridge (Temporal Anomaly Site)

The main control area of the abandoned luxury spaceship serves as the operational hub where the Doctor and Turlough coordinate the paradox resolution. It is a decaying, temporally unstable environment with flickering lighting, burnt circuitry, and the hum of failing engines, amplifying the crisis’s danger. Turlough hides from the Mutants in this cavernous, decaying setting.

Atmosphere Clammy with decay and urgency, illuminated by erratic emergency lighting and the metallic tang of …
Function Command hub for crisis resolution amid temporal decay
Symbolism Represents the fraying boundaries between order and chaos in time and space
Access Open, but dangerous due to temporal stress and unseen Mutants
Emergency lighting bleeding from cracked consoles in asymmetric pools of red and sickly gold The hum of the transmat capsule’s active locking systems cutting through the ship-wide spasms of chronal collapse

Narrative Connections

How this event relates to others in the story

What led here 1

"The Black Guardian's initial warning about the temporal anomaly (Act 1) directly drives Turlough's mission to keep the Brigadiers apart, culminating in the final instructions to stay in the capsule with the Brigadier (Act 3)."

Black Guardian ensnares Turlough with temporal peril
S20E12 · Mawdryn Undead Part 4

Themes This Exemplifies

Thematic resonance and meaning