Miniseries
An intimidating, ancient species surges from the depths, making a dramatic reveal to humanity and sparking an international crisis. With the entire population at risk, UNIT steps into action as land and sea forces wage war.
20255 EpisodesSci-Fi & Fantasy, Drama
Cast & Crew
Episode Guide
Barclay's ordinary life descends into a nightmare world as an ancient species surges from the sea. As UNIT contends for control, a Thames-side summit uncovers chilling secrets.