TDP 1439: The War Between the Land and the Sea Episode Four

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The War Between the Land and the Sea is a British science fiction television miniseries. The series was created by Russell T Davies for BBC One and Disney+ as part of the Doctor Who franchise, known as the Whoniverse.

Starring Russell Tovey and Gugu Mbatha-Raw, the series features UNIT in their attempt to prevent a global war caused by the return of the Sea Devils, also named "Homo Aqua". Jemma Redgrave, Colin McFarlane, Alexander Devrient and Ruth Madeley reprise their respective roles from Doctor Who and its franchised series. The series was first reported on in July 2024, and filmed from August to December 2024 across Wales, Cardiff and Spain. Of the five episodes, the premiere and finale were written by Davies, with the other three by Pete McTighe.

The War Between the Land and the Sea premiered on BBC One on 7 December 2025 with its first two episodes, and is scheduled to be released on Disney+ in 2026. The series has received generally positive reviews from critics for its performances (particularly Redgrave's) and its similarities to Torchwood.

Premise

UNIT must take action to prevent a global war once an ancient species, the Homo aqua, comes out from the sea, revealing itself to humanity.^[1]

Cast

Main

• Russell Tovey as Barclay Pierre-Dupont, a low-level member of UNIT, a transportation arranger, who is unexpectedly appointed as Ambassador by Salt
• Gugu Mbatha-Raw as Salt, the Ambassador of the Sea Devils

Recurring

• Jemma Redgrave as Kate Lethbridge-Stewart, the commander-in-chief of UNIT, who reprises her role from Doctor Who.
• Colin McFarlane as General Austin Pierce, a high-ranking American UNIT officer, who reprises his role from Torchwood: Children of Earth.
• Alexander Devrient as Colonel Christofer Ibrahim, a senior UNIT officer, part of Kate's personal staff, who reprises his role from Doctor Who.
• Ruth Madeley as Shirley Anne Bingham, UNIT's fifty-sixth scientific advisor, part of Kate's personal staff, who reprises her role from Doctor Who.
• Adrian Lukis as Jonathan Hynes, a politician initially appointed as humanity's ambassador
• Vincent Franklin as Harry Shaw, the Prime Minister of the United Kingdom
• Francesca Corney as Sergeant Hana Chakri, a UNIT soldier assigned to protect Barclay
• Ann Akinjirin as Barbara Pierre-Dupont, Barclay's estranged spouse
• Cat Gannon as Kirby Pierre-Dupont, Barclay and Barbara's teenage child

Guest

• Mei Mac as Min Tso, member of UNIT
• Waleed Hammad as Colonel Tariq Hashim, a UNIT field officer
• Hannah Donaldson as Captain Louise Mackie, a UNIT company officer
• William Gaminara as Ted Campbell, an ambassador selected to represent his nation
• Lachele Carl as Trinity Wells, a news reporter, who reprises her role from Doctor Who.

Episodes

No.	Title [2]	Directed by [3]	Written by [4]	Original release date [5]	UK viewers (millions) [6]
1	"Homo Aqua"	Dylan Holmes Williams	Russell T Davies	7 December 2025	TBD
2	"Plastic Apocalypse"	Dylan Holmes Williams	Pete McTighe	7 December 2025	TBD
3	"The Deep"	Dylan Holmes Williams	Pete McTighe	14 December 2025	TBD
4	"The Witch of the Waterfall"	Dylan Holmes Williams	Pete McTighe	14 December 2025	TBD
5	"The End of the War"	Dylan Holmes Williams	Russell T Davies	21 December 2025	TBD