Acid pool confirms lethal environment

The Doctor and Ian investigate an ancient pyramid on the planet's surface, but their attention shifts to a suspicious liquid pool. When the Doctor tests it with Ian's tie-belt, the fabric dissolves instantly, revealing the pool's corrosive nature. Ian insists he saw movement in the pool—a potential sign of the planet's hidden creatures—while the Doctor dismisses it as a distraction, prioritizing the interference signal. The discovery forces the companions to confront the immediate threat of their surroundings, with Ian's frustration at the Doctor's dismissal highlighting their contrasting approaches to danger. The moment also foreshadows the planet's true threats, as the Doctor's scientific curiosity clashes with Ian's growing unease about the unseen forces at play. The event serves as a turning point, escalating the tension and confirming the planet's hostility, which will later manifest in Barbara's hallucinations and Vicki's vulnerability in the TARDIS.

Plot Beats

The narrative micro-steps within this event

3

Ian directs the Doctor's attention to an ancient pyramid, sparking a brief intellectual debate about its age and relevance to their predicament.

inquisitiveness to dismissal

Ian discovers a pool of liquid, assuming it's water, but the Doctor halts him and tests the pool's contents with Ian's tie.

anticipation to caution

The Doctor's test reveals the pool contains a highly corrosive acid, destroying Ian's tie and prompting the Doctor to explain just how dangerous that water actually is.

alarm to understanding

Who Was There

Characters present in this moment

2

Frustrated and increasingly uneasy, with a sense of being unheard. His emotional state is a mix of irritation at the Doctor’s arrogance and genuine fear of the unseen dangers lurking in the pool.

Ian accompanies the Doctor, pointing out the pyramid and the acid pool. He insists on the presence of movement in the pool after the Doctor tests its corrosiveness with his tie-belt. Frustrated by the Doctor’s dismissal, Ian presses his concerns, only to be cut off by the Doctor’s insistence on focusing on the interference signal. His tie-belt, a personal item, is destroyed in the process, symbolizing his growing vulnerability on this hostile planet.

Goals in this moment
  • Convince the Doctor that the pool hides a threat (e.g., the mega-ant)
  • Protect himself and the group from immediate dangers, even if the Doctor ignores them
Active beliefs
  • The Doctor’s scientific approach is overlooking real, present dangers
  • His observations about the pool are valid and should not be dismissed
Character traits
Observant and cautious Frustrated by the Doctor’s dismissal Protective of his belongings (symbolic of his identity) Insistent on acknowledging immediate threats
Follow Ian Chesterton's journey

Focused and dismissive, with a hint of impatience toward Ian’s perceived distractions. His scientific curiosity masks a blind spot for immediate physical threats.

The Doctor leads the investigation of the pyramid and acid pool, using Ian’s tie-belt to test the liquid’s corrosiveness. He dismisses Ian’s warnings about movement in the pool, prioritizing the interference signal as the primary objective. His scientific curiosity drives the action, but his dismissive attitude toward Ian’s observations creates tension. The Doctor’s confidence borders on arrogance, as he assumes his analytical approach is superior to Ian’s instincts.

Goals in this moment
  • Determine the nature of the interference signal trapping the TARDIS
  • Analyze the planet’s environment for clues, even if it means disregarding Ian’s observations
Active beliefs
  • The interference signal is the most critical puzzle to solve
  • Ian’s observations are likely exaggerated or misinterpreted
Character traits
Scientifically methodical Dismissive of emotional warnings Confident to the point of arrogance Prioritizes logic over intuition
Follow The First …'s journey

Objects Involved

Significant items in this scene

4
Corrosive Acid Pool

The corrosive acid pool serves as a lethal threat and a narrative turning point. The Doctor uses it to test the planet’s environment, but its instant dissolution of Ian’s tie-belt reveals its deadly nature. Ian’s insistence on seeing movement beneath the surface foreshadows the mega-ant’s later appearance, escalating the tension. The pool symbolizes the planet’s hidden dangers, contrasting with the Doctor’s focus on the interference signal.

Before: A suspicious, gleaming liquid pool on the planet’s …
After: Confirmed as a corrosive acid threat, with remnants …
Before: A suspicious, gleaming liquid pool on the planet’s surface, untested but visually distinct from the barren landscape.
After: Confirmed as a corrosive acid threat, with remnants of Ian’s tie-belt dissolved. The pool remains a looming danger, and its contents are now known to hide potential mega-ant creatures.
Ian's Tie-Belt

Ian’s tie-belt, a personal item symbolizing his identity as a teacher from Coal Hill School, is used by the Doctor to test the acid pool’s corrosiveness. Its instant dissolution serves as a stark warning of the planet’s hostility. The destruction of the tie-belt also represents Ian’s growing vulnerability and the loss of a connection to his past life, heightening the emotional stakes of the scene.

Before: Worn around Ian’s waist as a functional and …
After: Dissolved into the acid pool, reduced to remnants. …
Before: Worn around Ian’s waist as a functional and symbolic item, representing his identity and past.
After: Dissolved into the acid pool, reduced to remnants. The tie-belt is no longer functional or symbolic, underscoring the planet’s destructive power.
Mega-Ant Sound

The mega-ant sound erupts after the stone is thrown into the pool, signaling the presence of giant, unseen creatures. This auditory cue amplifies the tension and confirms Ian’s warnings, though the Doctor remains dismissive. The sound serves as a narrative device, bridging the gap between Ian’s observations and the eventual confrontation with the mega-ants.

Before: Silent, but lurking beneath the surface of the …
After: Manifested as a sudden, ominous sound, revealing the …
Before: Silent, but lurking beneath the surface of the acid pool.
After: Manifested as a sudden, ominous sound, revealing the mega-ant’s presence and escalating the danger.
Stone Thrown into Corrosive Acid Pool

The stone thrown into the acid pool by Ian (after discarding the remnants of his tie-belt) triggers a ripple effect that briefly reveals a mega-ant beneath the surface. This moment confirms the pool’s hidden dangers and foreshadows the planet’s true threats. The stone acts as a catalyst, turning Ian’s frustration into tangible evidence of the unseen forces at play.

Before: A loose stone on the planet’s surface, unnoticed …
After: Plopped into the acid pool, causing ripples that …
Before: A loose stone on the planet’s surface, unnoticed until Ian’s action.
After: Plopped into the acid pool, causing ripples that expose the mega-ant. The stone’s role is now tied to the revelation of the planet’s hostility.

Location Details

Places and their significance in this event

2
Ancient Pyramid

The ancient pyramid, though initially investigated by the Doctor and Ian, is quickly dismissed as irrelevant to the interference signal. Its crumbling structure and shadowed stones hint at a lost civilization, but its role in this event is limited to serving as a backdrop to the more immediate threat of the acid pool. The pyramid’s irrelevance contrasts with the pool’s active danger, reinforcing the companions’ focus on survival over exploration.

Atmosphere Mysterious and decayed, with an air of abandonment. The pyramid’s shadows and cracks contribute to …
Function A potential clue or point of interest that is ultimately dismissed as irrelevant to the …
Symbolism Represents the planet’s forgotten history and the companions’ limited time to uncover its secrets. The …
Access Physically accessible but not explored due to the Doctor’s dismissal of its relevance.
Crumbling, weathered stones Shadowed and dilapidated structure Looming presence in the background of the scene
Barren Lifeless Planet (The Web Planet)

The barren planet surface serves as the primary setting for this event, characterized by its desolate landscape, thin toxic atmosphere, and persistent subsonic hum. The location’s hostility is underscored by the corrosive acid pool and the ancient pyramid, both of which hint at the planet’s lost civilizations and hidden dangers. The planet’s atmosphere contributes to the tension, amplifying the companions’ unease and vulnerability.

Atmosphere Tense and foreboding, with a sense of impending danger. The thin, toxic atmosphere and subsonic …
Function Hostile environment where the companions must navigate immediate threats (e.g., the acid pool) while investigating …
Symbolism Represents the unknown and the dangers of uncharted territory. The planet’s barrenness symbolizes the companions’ …
Access Open but perilous; the companions can move freely but are constantly at risk from environmental …
Thin, toxic atmosphere with a persistent subsonic hum Barren landscape with unusual rock formations Ancient pyramid looming in the background Corrosive acid pool as a central threat

Narrative Connections

How this event relates to others in the story

What this causes 4
Causal medium

"The Doctor dismisses Ian's concerns and continues to investigate. Rushing around in the environment leads to Ian being caught in a net trap."

Ian trapped in alien snare
S2E16 · The Web Planet
Causal medium

"The Doctor dismisses Ian's concerns and continues to investigate. Rushing around in the environment leads to Ian being caught in a net trap."

Ian’s trapped plea for the Doctor’s return
S2E16 · The Web Planet

"Something is moving in the acid pool and then Ian is caught in a trap, hinting at threats beneath the surface and the dangers of the planet."

Ian trapped in alien snare
S2E16 · The Web Planet

"Something is moving in the acid pool and then Ian is caught in a trap, hinting at threats beneath the surface and the dangers of the planet."

Ian’s trapped plea for the Doctor’s return
S2E16 · The Web Planet

Key Dialogue

"IAN: It must be water. Any form of life would need that, hey?"
"DOCTOR: Saved your life. You were about to have a wash in there, weren't you, or probably drink some of it? We very nearly had the remnants of a Coal Hill School teacher in there instead of his wretched old, ragged old tie."
"IAN: Doctor! There! There's something in there! I saw a light, it broke the surface."
"DOCTOR: Now, my young man. If this is your idea of revenge for that tie then I think it's a pretty poor effort."