Footprints fungus and failing oxygen

Jo takes initiative beyond the TARDIS walls, tracking unnatural footprints that reveal another presence on Spiridon. Her curiosity turns to pain as she brushes against carnivorous arum plants, while the Doctor’s sharp observation exposes the first sign of sabotage—the oxygen supply remains active despite the planet’s breathable atmosphere. Their separate reactions highlight contrasting skills: Jo’s willingness to confront danger directly and the Doctor’s methodical detection of systemic flaws, both essential to unraveling the crisis unfolding around them.

Plot Beats

The narrative micro-steps within this event

1

Jo examines footprints in the soil, discovering signs of life outside the TARDIS, and gets squirted by arum plants. The Doctor checks the console, noting the automatic oxygen supply is on despite the breathable atmosphere.

caution to curiosity ['outside the TARDIS, in a jungle-like …

Who Was There

Characters present in this moment

2

Determined curiosity masking cautious wariness

Jo Grant moves purposefully outside the deteriorating TARDIS, her breath visible in the cold air as she removes her mittens to examine disturbed footprints in the soil. She reacts with quick reflexes when a nearby arum plant squirts corrosive fluid at her, barely avoiding the hazard as she crouches to study the prints.

Goals in this moment
  • Determine the origin of unnatural footprints to assess potential threats
  • Avoid becoming a target of Spiridon’s carnivorous flora
Active beliefs
  • Assumes footprints are evidence of a dangerous presence on Spiridon
  • Trusts her senses and instincts over cautionary warnings
Character traits
Pragmatic Observant Physically resilient Immediate responder
Follow Jo Grant's journey

Focused and alert, with an undercurrent of controlled concern

The Doctor, now fully healed from his bullet wound, stands inside the TARDIS examining the console. He calls out for Jo with urgency before noticing the discrepancy in the ship’s environmental systems. His analytical demeanor shifts slightly as he identifies the sabotage, revealing his habit of both methodical investigation and rapid adaptability under threat.

Goals in this moment
  • Locate Jo Grant to ensure her safety outside the TARDIS
  • Discover and understand the source of the oxygen supply issue
Active beliefs
  • Believes the oxygen supply’s active state is unnatural despite the breathable atmosphere
  • Trusts the TARDIS’s systems implicitly unless direct evidence suggests tampering
Character traits
Sharply analytical Methodical Observant Calm under pressure
Follow The Fourth …'s journey

Objects Involved

Significant items in this scene

6
Carnivorous Pitcher Plants of Spiridon

The carnivorous arum plants outside the TARDIS coil aggressively, their striped violet and green stalks glistening with digestive fluid. As Jo brushes against them while examining the footprints, the plants squirt corrosive liquid toward her, forcing her to retreat quickly and heightening the immediate danger of the planet’s flora.

Before: Coiled around the TARDIS exterior, probing gaps with …
After: Actively targeting Jo, their corrosive spray narrowly avoiding …
Before: Coiled around the TARDIS exterior, probing gaps with needle-like tendrils and squirting corrosive fluid
After: Actively targeting Jo, their corrosive spray narrowly avoiding contact
Jo’s Mittens

Jo’s mittens, worn to protect against Spiridon’s harsh environment, are removed so she can examine the footprints with greater sensitivity. Though initially useful for handling rough terrain, their thickness is discarded in favor of precise touch, making her vulnerable to the arum plants’ corrosive spray.

Before: Worn wool mittens, slightly snagged and insulating Jo’s …
After: Removed and set aside, exposing Jo’s bare hands …
Before: Worn wool mittens, slightly snagged and insulating Jo’s hands from Spiridon’s chill
After: Removed and set aside, exposing Jo’s bare hands to the alien environment
Sabotaged TARDIS Oxygen Supply Cylinder

The automatic oxygen supply cylinder remains active despite the breathable atmosphere outside, betraying tampering. The Doctor identifies this anomaly during his console inspection, realizing that the system should have deactivated once the TARDIS landed on Spiridon, pointing to deliberate sabotage within the ship’s infrastructure.

Before: Silent and operational, blending into the TARDIS’s routine …
After: Revealed as a point of sabotage, its unexpected …
Before: Silent and operational, blending into the TARDIS’s routine environmental controls
After: Revealed as a point of sabotage, its unexpected activation triggering urgent investigation
TARDIS Oxygen Regulation Console (Atmospheric Control Panel)

The Doctor manipulates the TARDIS’s oxygen regulation console, adjusting valves and overriding automated systems as he notes the discrepancy in atmospheric data. His tactile interaction with the brass-framed, analog-heavy controls reveals hidden system flaws, combining physical engagement with scientific reasoning.

Before: Brass-framed control panel flickering with standard environmental readings
After: Urgently adjusted by the Doctor, with red indicator …
Before: Brass-framed control panel flickering with standard environmental readings
After: Urgently adjusted by the Doctor, with red indicator lights pulsing as he forces functionality under stress
Unnatural Footprints on Spiridon

The unnatural footprints are discovered by Jo in Spiridon’s soil outside the TARDIS, observed as pale, deliberate imprints that do not conform to natural steps or Thal physiology. These tracks lead her onward and become intricately linked to the sabotage when the Doctor correlates their presence with the mechanical malfunction in the oxygen system.

Before: Undisturbed soil surface showing no obvious signs of …
After: Clear but eerie footprints exposed and examined, their …
Before: Undisturbed soil surface showing no obvious signs of disturbance
After: Clear but eerie footprints exposed and examined, their unnatural precision becoming a focal point of investigation
The Doctor’s TARDIS

The battered TARDIS serves as a temporary refuge, its integrity compromised by the arum plants’ ongoing assault and the Doctor’s previous encounter with the Master. Inside, the Doctor actively monitors the console, revealing a critical systems discrepancy—the automatic oxygen supply is active despite the breathable atmosphere outside, indicating deliberate tampering.

Before: Damaged hull and stressed systems from external attacks …
After: Interior consoles flicker with emergency readings as the …
Before: Damaged hull and stressed systems from external attacks and previous sabotage
After: Interior consoles flicker with emergency readings as the Doctor overrides malfunctioning environmental protocols

Location Details

Places and their significance in this event

2
Spiridon Surface Transit Ramp (Loading Area)

The soil surface of Spiridon outside the TARDIS provides the stage for Jo’s discovery of unnatural footprints, revealing the presence of another entity on the planet. The soil’s gritty, shifting texture and the presence of predatory arum plants create a dangerous environment, pushing Jo to balance curiosity with immediate survival instincts.

Atmosphere Oppressive and distrustful, with a sense of latent danger beneath the planet’s neutral exterior
Function Investigative site and immediate danger zone, forcing direct engagement with the alien world
Symbolism Embodiment of the unknown and the precarious nature of exploration in hostile territories
Access Accessible only by venturing into Spiridon’s hazardous environment, limited by the TARDIS’s damaged state
Dusty soil clinging to boots and patterns, shifting underfoot Purple and green arum plants jutting erratically, ready to react to movement
TARDIS Lower Hull (Spiridon-Contaminated Section)

The lower section of the TARDIS serves as the Doctor’s operational base during this crisis, where he monitors the ship’s systems while calling for Jo. The environment reflects the ship’s compromised state—humid jungle air and corrosive residue seep in through damaged sections, creating a tense interface between safety and peril.

Atmosphere Humid and tense with a metallic tang, the air thick with the combined smells of …
Function Primary command and observation hub, providing shelter while exposing system vulnerabilities
Symbolism Represents the fragility of refuge and the cost of survival when systems of control are …
Access Limited to interior access; entry and exit are destabilized by external threats and ship damage
Corrosive plant liquid dripping and pooling on hexagonal metal plating Humidity and jungle chill mixing with the ship’s lingering chill from hyperspace transit

Narrative Connections

How this event relates to others in the story

What led here 2

"The Doctor's initial request for help (awakening from weakness) directly leads to Jo's subsequent actions in the TARDIS and jungle—her commitment to saving him drives her solo mission despite the Doctor's later collapse."

Doctor recovers to flee with Jo
S10E15 · Planet of the Daleks Part …

"Jo's physical commitment to dragging the weakened Doctor into the TARDIS parallels the Doctor's later desperate attempts to save himself in Act 3 (e.g., desperately trying to open the TARDIS door), both showing devotion to survival despite extreme peril."

Doctor recovers to flee with Jo
S10E15 · Planet of the Daleks Part …
What this causes 5

"The Doctor’s sudden recovery leads to his desperate attempt to open the TARDIS door when the atmospheric system fails, creating a direct cause-effect chain between recovery and survival behavior."

Doctor fights to open TARDIS door
S10E15 · Planet of the Daleks Part …

"The Doctor’s recovery and immediate awareness of his surroundings (calling for Jo) leads directly to his assertion of identity as a legendary figure from Thal history—a continuity of self-assertion and myth-making under pressure."

Doctor claims identity to Thals
S10E15 · Planet of the Daleks Part …

"The Doctor’s recovery and immediate awareness of his surroundings (calling for Jo) leads directly to his assertion of identity as a legendary figure from Thal history—a continuity of self-assertion and myth-making under pressure."

Thals treat Doctor for fatal fungus infection
S10E15 · Planet of the Daleks Part …

"The Doctor’s recovery and immediate awareness of his surroundings (calling for Jo) leads directly to his assertion of identity as a legendary figure from Thal history—a continuity of self-assertion and myth-making under pressure."

Doctor meets Thals amidst Spiridon's deadly fog
S10E15 · Planet of the Daleks Part …

"Jo’s examination of footprints in the soil—signs of life and potential contact—mirrors the Thals’ later tracking of Dalek movements and invisible Spiridons, emphasizing the shared challenge: finding what cannot be seen or trusted."

Jo endures the Spiridon jungle alone
S10E15 · Planet of the Daleks Part …

Themes This Exemplifies

Thematic resonance and meaning

Key Dialogue

"DOCTOR: That's odd. The atmosphere outside is breathable and yet the automatic oxygen supply is on."