In 1816, the Doctor and gang arrive at a villa near Lake Geneva in Switzerland; they plan to soak up the atmosphere as Lord Byron and the Shelleys prepare for a night telling ghost stories, but the villa proves to have ghostly presences all its own.

In the far future, the Doctor and her friends face a brutal battle across the farthest reaches of space to protect the last of the human race against the deadly Cybermen.

The Cybermen are on the march; as the last remaining humans are ruthlessly hunted down, Graham, Ryan and Yaz face a terrifying fight for survival.

While the Doctor is locked away in an alien prison, Yaz, Ryan and Graham discover a disturbing plan involving the Daleks.

The Doctor, Sarah and Harry arrive on a desolate and apparently deserted Earth to discover that a group of shipwrecked astronauts from a human colony, GalSec, have been lured there by a fake distress call. One of their number, Roth, tells Sarah of an alien conducting gruesome experiments on him and his crewmates. The alien turns out to be a Sontaran, Field-Major Styre, who is compiling a report on human physical and mental capabilities as a prelude to an invasion of Earth.

The Doctor encounters an old enemy in London's sewers before discovering the man is in cahoots with an even more powerful adversary.

Pluto Seven has failed to make contact since its return from deep space.

The Doctor initially believes the TARDIS has landed aboard a clipper ship.