BBC’s The War Between the Land and the Sea is nearly over, with its fifth episode scheduled to wrap up the season. The episode titled The End of the War will air on Sunday, December 21, 2025, at 8:05pm on BBC One and BBC iPlayer. It is this very last episode that, among other things, focuses on a dangerously rising sea and a final attempt to stop the disaster.The official synopsis for Episode 5 of The War Between the Land and the Sea sets the tone clearly. It says:“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?”What follows are the key details.The War Between the Land and the Sea Episode 5 release date View this post on Instagram Instagram PostThe episode 5 wraps up a release pattern that has stayed very tight. The show began with two episodes released together, then followed the same weekly rhythm for Episodes 3 and 4.This finale comes exactly one week after the last double drop. Fans already know the pressure is high going into this episode. Barclay is on his own, Salt is missing, and UNIT is struggling to hold control.Writer Russell T. Davies also teased what is coming. Speaking to the BBC, he said,“It has a shocking climax...It really pushes the envelope of what you can achieve, and I’m so happy with everything the cast and crew have done.”The comments offer a preview of what to expect from the finale.Where to watch the finale? Streaming details, exploredWatching The War Between the Land and the Sea Episode 5 is simple if you know where to look. The finale airs live on BBC One at 8:05pm on Sunday night. If live TV is not your thing, BBC iPlayer will stream the episode at the same time.The show has been easy to follow all season, and the finale keeps that trend. There are no split releases or surprise delays. Everything drops together, making it ideal for fans who like to watch as soon as possible. This final episode is expected to be a full hour and deliver key developments and resolution.Russell T. Davies also made one thing very clear about the tone of the show. In an interview with Televisual, he said,“This is a world without the Doctor, and we’re seeing how we cope as the human race...It’s little bit tougher than Doctor Who, it takes on tougher themes, and people have tougher reactions in it, again, because there’s no Doctor.”That approach shapes the tone of the finale.The cast of The War Between the Land and the Sea and what to expectThe cast returning for The War Between the Land and the Sea Episode 5 includes all the key faces fans have followed from the start. Russell Tovey returns as Barclay, playing a central role in the finale. View this post on Instagram Instagram PostGugu Mbatha-Raw is back as Salt, and Jemma Redgrave also returns as part of the UNIT leadership trying to survive the chaos.Supporting roles continue with Alexander Devrient, Colin McFarlane, and Ruth Madeley. Political pressure stays strong with Vincent Franklin appearing as Prime Minister Harry Shaw.Francesca Corney returns as Sergeant Hana Chakri, while Mei Mac continues as Min Tso. These characters keep the conflict grounded on land while the oceans rise.The story of The War Between the Land and the Sea itself brings together everything built so far. Traitors are still in play, fear is spreading, and trust is thin. With the Sea Devils, also known as Homo Aqua, angry at humanity for damaging the planet’s waters, the finale becomes more than a fight. It becomes a test of survival.The War Between the Land and the Sea Episode 5 is set to end the season with stakes that are extremely high for the Whoniverse. With a release on Sunday, December 21, 2025, at 8:05pm on BBC One and BBC iPlayer, the finale will bring Barclay, Salt, and UNIT to their breaking point.With its established storyline and returning cast, this final episode marks a significant conclusion for the series within the Whoniverse.Stay tuned to Soap Central for more.Also read: The World Between the Land and the Sea Episodes 3- 4 recap: A deepfake video threatens Earth with all-out war