1. Homo Aqua
Dec 7, 2025 44 minBarclay's ordinary life becomes a world of terror when an ancient species rises from the sea. As UNIT fights for control, the summit on the Thames reveals terrifying secrets.
Series 6.9
The War Between the Land and the Sea
20251 season75 ratings
When a fearsome and ancient species emerges from the ocean, dramatically revealing themselves to humanity, an international crisis is triggered. With the entire population at risk, UNIT step into action as the land and sea wage war.
Synopsis
When a fearsome and ancient species emerges from the ocean, dramatically revealing themselves to humanity, an international crisis is triggered. With the entire population at risk, UNIT step into action as the land and sea wage war.
Episodes
Seasons & episodes
1 season
2. Plastic Apocalypse
Dec 7, 2025 48 minBarclay becomes humanity's ambassador when the mysterious Salt emerges from the Tank. But his family's life is torn apart when Salt wreaks revenge upon all mankind.
3. The Deep
Dec 14, 2025 45 minBarclay makes a terrifying descent into the world of Homo Aqua. Back on the land, Kate stands alone as Downing Street conspires with the army to change the course of the war.
4. The Witch of the Waterfall
Dec 14, 2025 46 minBarclay and Salt go on the run in a war-torn London as UNIT reels from disaster. But when Tide threatens the land and Gunsberg advances his plans, the Severance schemes demand blood.
5. The End of the War
Dec 21, 2025 54 minBarclay stands alone, Salt is lost, UNIT is powerless, and the oceans rise as the war reaches its climax. While traitors conspire, can Barclay find Salt before it's too late?
Ensemble
Cast
Russell Tovey
Barclay Pierre-Dupont
Gugu Mbatha-Raw
Salt
Jemma Redgrave
Kate Lethbridge-Stewart
Ruth Madeley
Shirley Bingham
Production
The details
Release
2025
Seasons
1 season
Country
United Kingdom
Studio
Bad Wolf, BBC Studios Productions
Spoken languages: English
Watch
Trailers & clips
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