Fabula
Object
Object

Sporix Fungus (Airborne Infection)

A lethal airborne fungal pathogen adapted to Spiridon's atmosphere that infects organisms systemically through spores
2 appearances

Purpose

The fungus is a natural Sporix organism evolved to spread via liquid spores in Spiridon's atmosphere, making it an effective bioweapon when harnessed by advanced civilizations. This particular strain appears adapted to exploit Tellurian physiology specifically.

Significance

This deadly infection serves as the planet's primary defense mechanism and a critical plot device that forces the Doctor, Jo, and the Thals into fragile cooperation. Its outbreak tests their trust and becomes the basis for the Doctor's credibility when he asserts knowledge of Spiridon's history.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S10E15 · Planet of the Daleks Part 1
Thals treat Doctor for fatal fungus infection

Spiridon’s deadly fungus clings to the Doctor’s skin, causing visible lesions and threatening his life if untreated. The spores are spread by the corrosive liquids discharged by the planet’s vegetation, making the environment immediately perilous for the unprepared.

Before: A dormant but omnipresent threat in the environment, manifesting rapidly upon exposure.
After: Partially neutralized by Taron’s spray, though the Doctor remains vulnerable to further exposure.
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S10E15 · Planet of the Daleks Part 1
Doctor meets Thals amidst Spiridon's deadly fog

The Spiridon deadly fungus, active in airborne spores and condensing liquids around the TARDIS, immediately begins attacking exposed organic tissue. Blackening lesions visibly form on the Doctor’s cheek, prompting Taron’s urgent intervention. The infection’s rapid progression necessitates immediate care and frames the entire rescue as a race against biological annihilation.

Before: Present as microscopic grains in the jungle air, thriving on damp surfaces and recent TARDIS-related liquid discharge; highly contagious.
After: Partially neutralized on the Doctor’s exposed skin by spray treatment, though latent spores may remain in clothing and air.
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