Playback is currently unavailable for S1 E4 · The Witch of the Waterfall. Episode details remain available below.
The War Between the Land and the Sea
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.
- Created by:
- Russell T Davies
- Cast:
- Russell Tovey, Gugu Mbatha-Raw, Jemma Redgrave, Ruth Madeley
- Language:
- English
- Country:
- United Kingdom
- Network:
- BBC One
Episode guide
Seasons
Miniseries
Episodes
E01
Episode 1
★ 6.2Homo Aqua
2025-12-07 · 44mBarclay'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.
Watch progress · Not tracked
E02
Episode 2
★ 6.2Plastic Apocalypse
2025-12-07 · 48mBarclay 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.
Watch progress · Not tracked
E03
Episode 3
★ 5.6The Deep
2025-12-14 · 45mBarclay 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.
Watch progress · Not tracked
E04
Episode 4
★ 5.4The Witch of the Waterfall
2025-12-14 · 46mBarclay 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.
Current episode
E05
Episode 5
★ 4.8The End of the War
2025-12-21 · 54mBarclay 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?
Watch progress · Not trackedCast
Russell Tovey
Barclay Pierre-Dupont
Gugu Mbatha-Raw
Salt
Jemma Redgrave
Kate Lethbridge-Stewart
Ruth Madeley
Shirley Bingham
