Overview
- The five-part series launches on Sunday, December 7 with two episodes and concludes December 21 on BBC One and iPlayer.
- International release is slated for 2026 on Disney+, reflecting reporting that the BBC–Disney co-production and distribution deal is ending.
- According to the BBC synopsis, low-level UNIT staffer Barclay becomes humanity’s envoy when the mysterious Salt emerges, as Kate Lethbridge-Stewart leads the response to an ancient sea threat.
- The cast includes Russell Tovey, Gugu Mbatha‑Raw and Jemma Redgrave, with Alexander Devrient, Ruth Madeley and Colin McFarlane also appearing.
- A newly re-edited 90‑minute version of 1972’s The Sea Devils will air on December 7 ahead of the spin-off’s double-bill launch, with the series billed as the final release before a 2026 Christmas special and uncertain plans beyond.