Doctor Who
S20E15
· Terminus Part 3

Tegan refuses to kill cold bloodedly

Turlough seizes an opportune moment to corner Tegan with a harrowing moral question about the possibility of murder. His interrogation strips away the veneer of their surroundings, reducing their dire circumstances to a hypothetical necessity of violence. Tegan’s initial idealism wavers as she considers self-defense but recoils at premeditated killing, making her discomfort palpable. The exchange fractures their surface camaraderie and exposes the chasm between pragmatism and principle, planting the seeds for Turlough’s later corruption by the sentient crystal.

Plot Beats

The narrative micro-steps within this event

3

Turlough poses a philosophical question to Tegan about killing someone, sparking a discussion about morality and difficult choices.

curiosity to unease ['a staircase']

Tegan expresses hesitation and conditional willingness to kill, while Turlough presses for a clear stance on cold-blooded killing.

hesitation to frustration ['a staircase']

Tegan dismisses Turlough's inquiry as inappropriate and suggests leaving to find the control room, then exits.

frustration to exasperation ['a staircase']

Who Was There

Characters present in this moment

2
Tegan Jovanka
primary

Morally disquieted by confrontation, struggling between rigid ideals and the grim necessity she unwillingly concedes

Tegan sits slumped on the staircase, her voice tremulous and hesitant as she responds to Turlough’s unsettling question. She leaves abruptly, refusing the debate and rejecting his framing of hypothetical killing, but not before betraying a flicker of uncertainty about her own stated principles.

Goals in this moment
  • • To avoid engaging with Turlough’s nihilistic provocation
  • • To reassert her moral boundaries while secretly questioning their rigidity
Active beliefs
  • • Premeditated killing corrupts the soul beyond repair
  • • Life must be preserved even in extremity
Character traits
conflicted hesitant idealistic
Follow Tegan Jovanka's journey
Turlough
Schoolboy
 primary

Intentionally detached to expose weakness in others, masking latent restlessness and a proprietary disdain for Tegan’s idealism

Turlough perches on the staircase with stiff posture, his voice low and deliberate as he probes Tegan with a sudden, probing question about the morality of killing. He escalates from hypothetical musing to blunt dismissal, calling her a fool before the exchange fully ends.

Goals in this moment
  • • To unsettle Tegan by confronting her moral boundaries under duress
  • • To assert superiority in their fractured alliance
Active beliefs
  • • Human morality is situational and can be rationally dissected
  • • Trust is a liability and idealism a liability
Character traits
calculating provocative defiant
Follow Turlough's journey

Location Details

Places and their significance in this event

1
Terminus Space Liner

The staircase aboard the space liner serves as a confined, intimate battleground for moral argument, its metal steps reverberating with the failing engines’ pulse. The dim, flickering light and the pressurized air accentuate the oppressive isolation, allowing no escape from Turlough’s rhetorical assault. The location’s claustrophobic atmosphere mirrors the narrowness of Tegan’s moral retreat.

Atmosphere Clammy and tense with urgency
Function confinement chamber for psychological confrontation
Symbolism Represents moral isolation and the faltering boundaries between civilization and survival
Access Restricted to immediate survivors navigating derelict corridors
Damp metallic air with ozone tang Intermittent shuddering of the deck plates

Narrative Connections

How this event relates to others in the story

What this causes 1
Causal

"Turlough's philosophical inquiry about killing (beat_09917836f8ca2317) leads to his eventual adherence to the sentient crystal's demand for obedience and his plan to kill the Doctor (beat_7a9e7601325bee24), revealing the crystal's influence over his moral compass and mission."

Turlough surrenders to crystal’s command
S20E15 · Terminus Part 3

Part of Larger Arcs

Tegan Jovanka and Turlough's strained alliance amid survival maneuvers and clashing moral perspectives

Key Dialogue

"TURLOUGH: If ever you had to kill someone, could you do it? Could you?"
"TEGAN: No. I don't know. If it was important, to save my friend, to defend myself."
"TURLOUGH: But cold-bloodedly?"