Sensorite City

Sensorite City divides into ten districts fed by one central water supply, the vector for atropine poison that sickens residents district by district. The Doctor tests samples from each area in the laboratory, exposing the palace district's contamination first and forcing Sensorite scientists to abandon their flawed assumptions. Stone paths wind past central fountains where guides block greetings to lower castes, sparking Ian, Susan, and the Doctor's debates on inequality. Looming buildings frame John's warnings of evil minds, while water sounds mix relief from outer threats with plague-driven distrust.