On July 26th, 2024, the BBC finally confirmed the longstanding rumour that there would be a forthcoming Doctor Who spin-off entitled The War Between The Land And The Sea. Featuring the Unified Intelligence Taskforce in a battle against the Sea Devils, it will run five episodes, written by Doctor Who showrunner Russell T Davies with Pete McTighe, who was responsible for the Thirteenth Doctor adventures Kerblam! and Praxeus. The director is Dylan Holmes Williams (73 Yards and Dot And Bubble), with production running from August to December 2024.

Two Doctor Who alumni will be starring in The War Between The Land And The Sea as new characters: Gugu Mbatha-Raw previously played Tish Jones, sister to companion Martha Jones, in a number of 2007 episodes starting with Smith And Jones, while Russell Tovey made a pair of appearances as Midshipman Frame beginning with the same year's Voyage Of The Damned. They will join several actors who are returning to familiar roles associated with the Unified Intelligence Taskforce, including Jemma Redgrave as Kate Stewart (a recurring character since 2012's The Power Of Three), Alexander Devrient as Colonel Ibrahim (who first appeared in 2023's The Giggle) and Ruth Madeley as scientific adviser Shirley-Anne Bingham (introduced in 2023's The Star Beast). In addition, Colin McFarlane is back as United States Army General Pierce from Children Of Earth, the 2009 season of spin-off series Torchwood.