The War Between the Land and the Sea is a five-part Doctor Who spin-off miniseries that premiered on BBC One and BBC iPlayer on December 7, 2025, and is scheduled for international release on Disney+ in 2026. Created by Russell T Davies, the series centers on the international military organization UNIT as they confront a global crisis sparked by the emergence of the Sea Devils—an ancient aquatic species now referred to as Homo Aqua. Starring Russell Tovey as Barclay Pierre-Dupont and Gugu Mbatha-Raw as the aquatic ambassador Salt, the show bridge the gap between seasonal Doctor Who arcs, exploring a high-stakes conflict where humanity’s survival hangs in the balance without the Doctor’s direct intervention.
Series Overview and Plot Premise
The series serves as a gritty, geopolitical thriller that shifts the focus from time travel to terrestrial defense. It begins when an ancient race of “Sea Devils” (Homo Aqua) wakes up to find Earth’s oceans ravaged by human pollution and climate change, leading them to declare war on the surface world.
Unlike the main Doctor Who series, The War Between the Land and the Sea adopts a tone similar to Torchwood, focusing on the moral complexities of war and the failures of international diplomacy. The story follows Barclay, a low-level UNIT logistics manager who is thrust into the role of humanity’s ambassador, and Salt, a member of the Homo Aqua who seeks a peaceful resolution amidst rising tensions from militant factions on both sides.
Cast and Returning Characters
The series features a blend of new leads and established Doctor Who veterans, creating a sense of continuity within the broader franchise. Both lead actors, Russell Tovey and Gugu Mbatha-Raw, previously appeared in the Tenth Doctor era in different roles, marking their high-profile return to the “Whoniverse.”
Lead Protagonists
Russell Tovey as Barclay Pierre-Dupont: A relatable “everyman” at UNIT whose unexpected promotion to ambassador provides the emotional core of the series.
Gugu Mbatha-Raw as Salt: A Homo Aqua representative who leads the aquatic delegation. Salt’s design is more humanoid than traditional Sea Devils, allowing for a nuanced performance beneath sophisticated prosthetics.
The UNIT Team
Jemma Redgrave as Kate Lethbridge-Stewart: The Commander-in-Chief of UNIT, reprising her long-standing role as the defender of Earth.
Ruth Madeley as Shirley Anne Bingham: UNIT’s 56th Scientific Advisor, whose technical expertise is vital in counteracting Homo Aqua technology.
Alexander Devrient as Colonel Christofer Ibrahim: Kate’s senior officer and close confidant, who plays a pivotal role in the tactical defense of the UK.
The Homo Aqua: A New Vision
The Sea Devils have been part of Doctor Who history since 1972, but this series provides their most detailed exploration yet. Renamed Homo Aqua, the species is presented as the rightful, ancient inhabitants of the Earth’s oceans rather than mere monsters.
Subspecies and Design
In 2026, fans have praised the dual-track design of the Homo Aqua. The “Warriors” retain the classic turtle-like finned appearance of the original 1970s designs (updated with modern VFX), while the “Ambassadors” like Salt and Tide feature a more expressive, mammalian-reptilian hybrid look. This allows the series to explore the internal politics of the aquatic civilization, with different factions debating whether to negotiate with or exterminate the “apes” on the surface.
Production and Filming Locations
Filming for the series took place between August and December 2024, managed by Bad Wolf Studios in association with BBC Studios. The production utilized a mix of real-world locations and massive practical sets to achieve its cinematic scale.
Cardiff, Wales: The primary production hub. Locations included Cardiff City Hall and the National Museum Cardiff, which doubled as international summit halls.
Bad Wolf Studios: Home to the “Empress Hall” set—a massive underwater environment constructed for Salt’s domain.
Mallorca, Spain: Used for the Mediterranean sequences where the first Sea Devil contact is made by local fishermen.
Bristol, England: Filming occurred at the Lloyds Amphitheatre and the Clifton area for key urban action sequences.
Practical Information for Fans
Planning to dive into the world of UNIT and the Sea Devils? Here is the essential data for the 2026 viewer.
Total Runtime: Approximately 240 minutes across 5 episodes.
Soundtrack: Composed by Lorne Balfe, the digital album was released in December 2025, with a physical CD following in January 2026.
Age Rating: In the UK, the series carries a 12 rating due to scenes of intense peril and moderate violence.
Watching Order: While it is a spin-off, it is best viewed after Doctor Who Season 14 (Season 1) and before the 2026 Christmas Special for full context on UNIT’s status.
FAQs
When is the release date on Disney+?
While it aired in the UK in late 2025, the Disney+ release is confirmed for 2026, with international fans awaiting an exact month from Disney.
Do I need to watch Doctor Who to understand it?
No, the series is designed as a standalone thriller. However, knowing who Kate Lethbridge-Stewart and UNIT are adds depth to the experience.
Is the Doctor in the series?
Ncuti Gatwa’s Doctor does not appear in the series. The show explicitly focuses on how humanity copes when the Doctor is not there to help.
Who are the Sea Devils?
They are Homo Aqua, an ancient species that lived on Earth millions of years ago and went into hibernation, only to wake up in the modern day.
How many episodes are there?
There are five episodes, ranging from 43 to 53 minutes in length.
Why is Russell Tovey in it if he was in a 2007 episode?
He is playing a new character named Barclay. In the Whoniverse, it is common for actors to return as different characters (similar to Gugu Mbatha-Raw).
Is there going to be a Season 2?
Currently, the show is billed as a miniseries, meaning it has a definitive ending. There are no plans for a second season at this time.
Was the show filmed underwater?
Most “underwater” scenes were filmed using “dry-for-wet” techniques and massive physical sets in Cardiff, supplemented by CGI.
Who wrote the series?
Showrunner Russell T Davies wrote the premiere and finale, while Pete McTighe (who wrote Kerblam!) wrote the middle three episodes.
Is Torchwood mentioned?
While the tone is similar, the series focuses on UNIT. However, fans have noted several Easter eggs referencing the broader history of alien defense in the UK.
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