Overview
- BBC One and BBC iPlayer premiere begins at 8:30pm with a back-to-back double bill to launch the five-episode run.
- Russell Tovey leads as Barclay opposite Gugu Mbatha‑Raw’s Salt, with Jemma Redgrave returning as UNIT chief Kate Lethbridge‑Stewart.
- The story follows a first-contact crisis as the ancient ocean species Homo Aqua emerges, placing a low-level UNIT staffer at the center of global negotiations.
- Creators describe a tougher tone than Doctor Who, emphasizing high-stakes action and character reactions in the absence of the Doctor.
- Production features large-scale underwater environments including the Empress Hall set, with location work at Cardiff City Hall, National Museum Cardiff, Bristol’s harbourside and Canynge Road, and sequences filmed in Mallorca.