Doctor Who
S20E13
· Terminus Part 1

Doctor recognizes TARDIS systems in peril

The TARDIS corridor fills with a creeping mist of unnatural origin, seeping from Nyssa’s quarters. Tegan stumbles upon the phenomenon and immediately alerts the Doctor, who rushes to the source. His rapid diagnosis confirms the ship’s systems are destabilizing under a hidden threat, demanding urgent action. The mist’s presence forces the Doctor to abandon explanation and act swiftly, exposing the TARDIS’s compromised state and the crew’s precarious position. Tegan’s shock mirrors the audience’s dawning understanding that their escape route itself is now compromised, tying directly to Turlough’s hidden sabotage. key_dialogue: [ TEGAN: Turlough? Oh, no. Doctor! DOCTOR: What is it? TEGAN: Quickly! DOCTOR: We're in trouble. I'll explain later. ]

Plot Beats

The narrative micro-steps within this event

3

Tegan alerts the Doctor to the mysterious mist appearing in Nyssa's room, prompting the Doctor to investigate.

calm to concern ["Nyssa's room in the TARDIS"]

The Doctor rushes to examine the mist, indicating a serious problem with the TARDIS.

concern to alarm ["the mist in Nyssa's room"]

The Doctor confirms the situation is dire, telling Tegan they are in trouble, and promises to explain later.

alarm to urgency

Who Was There

Characters present in this moment

3
The Fifth Doctor
Time Lord
 primary

Calm urgency masking underlying concern for the TARDIS’s stability

The Doctor rushes toward the mist with decisive speed, his demeanor methodical yet urgent. He does not pause to question the mist’s nature, immediately diagnosing the TARDIS as being in grave danger from an unknown threat, prioritizing action over explanation.

Goals in this moment
  • • identify and address the source of the mist
  • • protect the TARDIS’s integrity and crew safety
Active beliefs
  • • the TARDIS’s coherence must be defended at all costs
  • • urgent threats require swift, decisive response
Character traits
analytical under pressure protective toward companions prioritizes action over exposition
Follow The Fifth …'s journey
Tegan Jovanka
primary

Alarmed and urgent, masking deeper fear with assertive action

Tegan stumbles into the unnatural mist, her voice sharp with alarm as she calls the Doctor. She stands frozen mid-stride, boots pressed into the corridor’s worn plastoid flooring, her breath hitching at the mist’s clammy touch.

Goals in this moment
  • • alert the Doctor to the immediate danger
  • • ensure the crew’s safety by sounding the alarm
Active beliefs
  • • the Doctor can resolve any threat
  • • hesitation is perilous
Character traits
quick-thinking in crisis protective instinct direct and urgent communication
Follow Tegan Jovanka's journey
Supporting 1
Nyssa
Companion of the Doctor
 secondary

Surprised and unsettled by the intrusion of the unnatural mist

Nyssa turns to stare at the mist as it enters her quarters through the wall, her Trakenian poise momentarily unsettled by the intrusion. Though silent, her presence underscores the event’s gravity as a witness to the TARDIS’s compromised state.

Goals in this moment
  • • assess the threat’s origin and implications
  • • support the Doctor in stabilizing the TARDIS
Active beliefs
  • • the TARDIS’s systems can be repaired with logic
  • • silent vigilance is necessary in crisis
Character traits
witness to crisis quiet intensity scientific curiosity subdued by danger
Follow Nyssa's journey

Objects Involved

Significant items in this scene

1
Unnatural Mist from Nyssa’s Quarters

The creeping, spectral mist from Nyssa’s quarters seeps into the TARDIS corridor, its unnatural tendrils curling through the air with a clammy chill. It acts as a visible indicator of the hidden threat destabilizing the TARDIS, forcing immediate attention and threatening the ship’s coherence.

Before: Contained within Nyssa’s private quarters as a creeping …
After: Infiltrating the TARDIS corridor, spreading toward the Doctor …
Before: Contained within Nyssa’s private quarters as a creeping vapor seeping from a vent near the ceiling
After: Infiltrating the TARDIS corridor, spreading toward the Doctor and Tegan with visible density

Location Details

Places and their significance in this event

2
Nyssa's Private TARDIS Quarters

Nyssa’s quarters function as the origin point of the unnatural mist, a space usually private and controlled now breached by an invasive force. The mist’s seepage symbolizes the compromise of even the most protected personal sanctuary aboard the TARDIS, underscoring the threat’s severity.

Atmosphere Disrupted and unsettling, the air thick with ozone and the intrusion of the spectral mist …
Function source of contamination
Symbolism Represents vulnerability of personal space to insidious threats
Access Private to Nyssa but becomes breached by the mist
A narrow vent near the ceiling emits the creeping mist Sleek, unadorned surfaces now marred by creeping condensation Emergency lights reflect eerily off the mist's tendrils
TARDIS: Navigation Corridor

The TARDIS corridor serves as the stage for crisis, its curved expanse narrowing under the pressure of the unnatural mist. The mist’s presence transforms the corridor from a familiar transit space into a site of immediate peril, where the crew’s safety hinges on urgent intervention.

Atmosphere Tense and unstable, the corridor’s usually familiar amber lighting and brass fixtures now cast elongated, …
Function primary transit and danger zone
Symbolism Represents the fragility of safety and the TARDIS’s vulnerability to hidden threats
Access Unrestricted, but the mist encroaches unpredictably
Hexagonal roundels line the walls Low amber light pools shift under the mist's intrusion Emergency systems hum amid the mist's unnatural chill

Narrative Connections

How this event relates to others in the story

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