The Deep Synopsis
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.
Episode 3 of 5 from The War Between the Land and the Sea
Sunday, 14th December 2025 8:30PM BBC One (44 mins)
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.
Barclay Pierre-Dupont
Russell Tovey
Salt
Gugu Mbatha-Raw
Kate Lethbridge-Stewart
Jemma Redgrave
General Austin Pierce
Colin McFarlane
Ted Campbell
William Gaminara
Captain Louise Mackie
Hannah Donaldson
Min Tso
Mei Mac
Ravi Singh
Manpreet Bachu
Shirley Bingham
Ruth Madeley
Captain Daniel Gaitz
John Addison
Barbara Pierre-Dupont
Ann Akinjirin
Kirby Pierre-Dupont
Cat Gannon
Commander Olivia Harper
Teri Ann Bobb-Baxter
Prime Minister Harry Shaw
Vincent Franklin
Sir Keith Spears
Patrick Baladi
General Dominique Dussolier
Barbara Probst
General Oscar Gunsberg
Stewart Alexander
Priya Lakhani
Seeta Indrani
Colonel Christofer Ibrahim
Alexander Devrient
Steve Chesney
George Robinson
Corporal Jane Hart
Catherine Garton