Fabula
Object
Object

Acid Tidal Pool (Glass Beach)

Shallow, clear, viscous pool of corrosive acid on Marinus glass beach where Susan Foreman’s shoe dissolves upon contact. Directly interacted with by the crew, demonstrating the planet’s immediate environmental hazards.
1 appearances

Purpose

Dissolves organic materials like shoes on contact

Significance

Reveals Marinus sea's lethality, prompts Susan's return to TARDIS for replacements, amplifies crew unease over her solo pyramid pursuit

Appearances in the Narrative

When this object appears and how it's used

1 moments
S1E21 · The Sea of Death
Acid sea revealed and frogman discovery

The acid tidal pool is the site where Susan’s shoe dissolves, exposing the sea’s corrosive nature. This shallow pool of clear, viscous acid serves as a microcosm of the larger environmental threat, forcing the group to adapt their behavior. Ian’s observation of the shoe’s rapid dissolution triggers the group’s realization of the danger, while Barbara reassures Susan. The pool’s fizzing acid underscores the island’s hostility, blending deceptive calm with lethal unpredictability.

Before: Calm and inviting, appearing as a shallow pool of clear water.
After: Disturbed by the dissolving shoe, with its corrosive nature now exposed to the group.
View full event