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The War Between the Land and the Sea
RELEASED·SERIES·EN

The War Between the Land and the Sea

Sun, Dec 7, 2025
  • Sci-Fi & Fantasy
  • Drama
Series · Synopsis

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.

Trailer

Watch the trailer

Where to watch

Streaming on

  • BBC One↗
Cast

Top of the call sheet

  • Russell Tovey
    Russell Tovey
    as Barclay Pierre-Dupont
  • Gugu Mbatha-Raw
    Gugu Mbatha-Raw
    as Salt
  • Jemma Redgrave
    Jemma Redgrave
    as Kate Lethbridge-Stewart
  • Ruth Madeley
    Ruth Madeley
    as Shirley Bingham
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Episodes

1 season · 5 episodes

Ended · 5 aired
Season 1
5 episodes · 5 aired
▾
  • E1
    Homo Aqua
    Aired · Sun, Dec 7, 2025 · 44m

    Barclay'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.

  • E2
    Plastic Apocalypse
    Aired · Sun, Dec 7, 2025 · 47m

    Barclay 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.

  • E3
    The Deep
    Aired · Sun, Dec 14, 2025 · 44m

    Barclay 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.

  • E4
    The Witch of the Waterfall
    Aired · Sun, Dec 14, 2025 · 45m

    Barclay 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.

  • E5
    The End of the War
    Aired · Sun, Dec 21, 2025 · 54m

    Barclay 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?