The Doctor is called to a distant planet to help an underground civilization whose only power source has become unstable.

The Doctor's look-alike invades Tigella and a surprise awaits Romana behind the burnt vegetation.

The Doctor will be crushed to death.

The Doctor uncovers the Dodecahedron's secret.

The Doctor, Ryan, Graham and Yaz arrive in 17th century Lancashire and become embroiled in a witch trial, run by the local landowner. As fear stalks the land, the arrival of King James I only serves to intensify the witch hunt.

The Doctor discovers that the surviving Earthlings have not been revived and are in the clutches of the wasp-like Wirrns.

The survivors of the human race begin to awaken.

On the edge of a Norwegian fjord, in the present day, The Doctor, Ryan, Graham and Yaz discover a boarded-up cottage and a girl named Hanne in need of their help. What has happened here? What monster lurks in the woods? cottage – and beyond?

The Doctors embark on their greatest adventure across space and time in this 50th Anniversary Special.

Still reeling from their first encounter, can the Doctor and her new friends stay alive long enough in a hostile alien environment to solve the mystery of Desolation? And just who are Angstrom and Epzo?