A group of workers on a remote Scottish oil rig are due to return to the mainland when a mysterious fog enshrouds them and supernatural forces take hold.
Cast: Emily Hampshire, Iain Glen, Martin Compston, Rochenda Sandall, Molly Vevers, Abraham Popoola, Owen Teale, Stuart McQuarrie, Nikhil Parmar, Calvin Demba, Richard Pepple, Ross Anderson, Phil McKee, Mark Addy, Alice Krige, Johannes Roaldsen Fürst, Neshla Caplan, Cameron Fulton
The Bravo team races to reach the Heart of the Ancestor before Pictor. They discover Darian has a final move, forcing Rose and Fulmer into a heroic self-sacrifice to stop him.
Rose and Cameron race to stop Pictor from stealing data, but an ambush on the Wet Dock takes an unexpected turn with a gunshot.
After a crew member's death, the team faces a perilous blizzard, encounters the enigmatic Ancestor, and confronts an internal threat amidst the harrowing conditions.
Fulmer's wife Rose leaves him, making him vulnerable to Coake's manipulation. Coake plans to exploit Fulmer, but his schemes are disrupted when Cameron takes an extreme action that alters the course of events.
The Bravo crew is trapped on a high-tech rig and must undertake a rescue mission in the deep ocean, unaware of the dangers lurking on the seabed as Pictor conceals crucial information about the mission.
Oil rig crew rescued by helicopter, relocated. They face dangers, conspiracies, and threats from ocean depths. Storyline explores Earth's history, present, future with thrills and action for characters. Objective plot points presented.