Object

Mistfall Contamination Trace Slide

Contains condemned tissue revealing forbidden Mistfall contamination patterns

2 appearances

Appearances in the Narrative

When this object appears and how it's used

2 moments

Science team discovers Mistfall trace in alien tissue

The Mistfall Trace Slide is not directly shown but implicitly referenced when the Doctor demands tissue samples from Dexeter and the marsh child, seeking corroboration of the nitrogen anomaly already suggested by the spider’s biology. It represents forensic proof of the Deciders’ cover-up regarding Mistfall’s true nature and recurring cycle.

Before: Likely stored in a restricted drawer within the Science Unit, labeled and sealed as privileged evidence

After: Targeted for acquisition—its contents sought by the Doctor to confirm his hypothesis and challenge Decider doctrine

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S18E11 · Full Circle Part 3

Doctor learns Romana abducted

The Mistfall Trace Slide is referenced during the Doctor’s demand to know what Dexeter did with it, representing a physical artifact of forbidden knowledge about nitrogen poisoning and Mistfall. Its existence heightens the conflict between institutional control and truth, becoming a catalyst when the Doctor’s focus shifts to Romana’s disappearance.

Before: Held by the Doctor or Login within the lab space, treated as a key piece of contested evidence.

After: Unresolved—its specific location is left ambiguous after the disturbance.

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