The BEST episodes of The War Between the Land and the Sea season 1

Every episode of The War Between the Land and the Sea season 1, ranked from best to worst by thousands of votes from fans of the show. The best episodes of The War Between the Land and the Sea season 1!

When a fearsome and ancient species emerges from the ocean, dramatically revealing themselves to humanity, an international crisis is triggered.

Last Updated: 1/17/2026Network: BBC OneStatus: Ended
Plastic Apocalypse
star
7.50
428 votes

#1 - Plastic Apocalypse

Season 1 - Episode 2 - Aired 12/7/2025

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.

Writer: Pete McTighe
Watch Now:Amazon
The Deep
star
7.41
393 votes

#2 - The Deep

Season 1 - Episode 3 - Aired 12/14/2025

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.

Writer: Pete McTighe
Watch Now:Amazon
The Witch of the Waterfall
star
7.41
370 votes

#3 - The Witch of the Waterfall

Season 1 - Episode 4 - Aired 12/14/2025

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.

Watch Now:Amazon
Homo Aqua
star
7.26
502 votes

#4 - Homo Aqua

Season 1 - Episode 1 - Aired 12/7/2025

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.

Watch Now:Amazon
The End of the War
star
7.10
378 votes

#5 - The End of the War

Season 1 - Episode 5 - Aired 12/21/2025

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?

Watch Now:Amazon