The Steel Cascade (audio story)

 was an exclusive-to-audio story from BBC Audio featuring Doom, written by Darren Jones, released on 24 August 2023 and was the first story in the audio anthology Four From Doom's Day. It was released in celebration of the 60th Anniversary of Doctor Who.

It was the eleventh overall story in the Doom's Day multimedia series.

Publisher's summary
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Plot
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Characters

 * Doom
 * Ian Chesterton
 * Barbara Wright
 * Anton Skutnick
 * Dasha Petrov/The Red Gorgon
 * Nanoforms/The Steel Cascade

Worldbuilding

 * The Jolly Wanderer is passing through the Dardanelles.
 * Skutnick escaped Soviet spies via Belgrade and Istanbul.

Continuity

 * Doom previously remarked she was glad the next mission was on a cruise. (GAME: Wrong Place at the Right Time)
 * Ian and Barbara miss Vicki, the Doctor (TV: The Chase) and Susan (TV: The Dalek Invasion of Earth)