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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 1 Online

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

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

Dec 7, 2025 Season 1 Episode 1 44 min

6.3 ★ ★ ★ ★ ★

54 votes

The War Between the Land and the Sea Season 1

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Season 1 Episode 1 — Aired on Dec 7, 2025 • runs about 44 minutes.

Directed by Dylan Holmes Williams.

Written by 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 1 online”? This is a legal-only guide with synopsis, stills, and navigation for this season.

Synopsis

La vie paisible de Barclay bascule dans l'horreur lorsqu'une espèce ancestrale surgit des profondeurs marines. Tandis qu'UNIT lutte pour reprendre le contrôle, le sommet sur la Tamise révèle d'effroyables secrets.