When a fearsome and ancient species emerges from the ocean, dramatically revealing themselves to humanity, an international crisis is triggered. With the entire population at risk, UNIT step into action as the land and sea wage war.
 
Bonus Features
Dive deeper into the world of 'The War Between the Land and the Sea' with an extensive collection of behind-the-scenes content, deleted scenes, and interviews. Highlights include:
Deep Dive' Documentary - Access all areas: go behind the scenes with cast and crew (~30 mins)
Character Dossiers: Barclay, Ibrahim, Kate, Salt & Homo Aqua
Set Tours: Empress Hall and Homo Aqua Habitat
Video Diaries: Alex and Homo Aqua
Featurettes:
Interview with the Writers (~15 mins)
Trailer
Extended and deleted scenes for Episodes 1–4 
Exclusive to DVD, Blu-ray & Steelbook:
Audio Commentaries for Episodes 1 & 3
Sea Devils (2025 version) - a brand new 90-minute edit of the classic Third Doctor sto