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Watching earlier episodes in season 1 helps you follow the plot and character arcs leading into this episode.

Watch The War Between the Land and the Sea Season 1 Episode 4 Online

Q: Where can I watch “The War Between the Land and the Sea” Season 1 Episode 4 online?

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“The Witch of the Waterfall” — Watch "The War Between the Land and the Sea" Season 1 Episode 4 online in HD for free. Check streaming providers, cast, and episode details.

Dec 14, 2025 Season 1 Episode 4 46 min

5.4 ★ ★ ★ ★ ★

25 votes

The War Between the Land and the Sea Season 1

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Season 1 Episode 4 — Aired on Dec 14, 2025 • runs about 46 minutes.

Directed by Dylan Holmes Williams.

Written by Pete McTighe, Russell T Davies.

Notable cast/guest names in this episode include Russell Tovey, Gugu Mbatha-Raw, Jemma Redgrave, Ruth Madeley.

This page includes 2 official still(s) (when available) plus legal availability links.

Looking for “watch The War Between the Land and the Sea Season 1 Episode 4 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

Barclay et Salt fuient dans un Londres ravagé par la guerre, tandis que UNIT est dévasté. Lorsque Tide menace la terre ferme et que Gunsberg met ses plans à exécution, les machinations de Severance exigent du sang.