Series 12, Episode 6 | 1 part | First broadcast: 2 February 2020 | Writers: Pete McTighe and Chris Chibnall | Director: Jamie Magnus Stone
Cast
- Jodie Whittaker as the Thirteenth Doctor
- Bradley Walsh as Graham O’Brien
- Tosin Cole as Ryan Sinclair
- Mandip Gill as Yasmin Khan
- Matthew McNulty as Adam
- Warren Brown as Jake Willis
Summary
A mysterious environmental illness turning birds and humans into ash-like husks leads the Doctor and her companions across multiple continents—from a Madagascar beach to a Hong Kong hospital to the depths of the ocean—tracing the affliction to an alien bio-weapon called Praxeus that has fused with plastic pollution in the world’s oceans, forcing an international team of astronauts, scientists, and ordinary people to work together against both the alien threat and a very real environmental crisis.
Interesting Facts
- The episode carries an explicit environmental message about plastic pollution, continuing the season’s recurring theme of real-world ecological anxiety following “Orphan 55.”
- It was filmed across multiple real international locations, reflecting the story’s globe-trotting structure spanning several countries in a single episode.
- The story features one of the season’s larger ensemble casts of one-off guest characters, split across simultaneous story threads that gradually converge.
- Co-writer Pete McTighe had previously written “Kerblam!,” continuing a pattern of topical, message-driven episodes in the Chibnall era.
- The alien Praxeus organism’s biology was designed around a real-world anxiety about microplastics entering the food chain and animal life.
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