Harry and Sarah walk into a trap on the uninhabited Earth. Dr. Who: Tom Baker. Harry: Ian Marter. Sarah: Elisabeth Sladen. Styre: Kevin Lindsay. Erak: Peter Walshe. Zake: Terry Walsh.

With his new assistant Romana (Mary Tamm), the Doctor begins the search for the Key to Time. Dr. Who: Tom Baker. Voice of K9: John Leeson. Vynda-K: Paul Seed. Guardian: Cyril Luckham. Garron: Iain Cuthbertson. Unstoffe: Nigel Plaskitt. Binro: Timothy Bateson.

The Doctor must penetrate the Citadel to save the astronauts' race. Dr. Who: Tom Baker. Leela: Louise Jameson. Idas: Norman Tipton. Jackson: James Maxwell. Orfe: Jonathan Newth. Tala: Imogen Bickford-Smith.

The Doctor, Romana and K9 are led by the tracer to the Nine Travellers, a circle of standing stones on Boscombe Moor in present-day England, but the third segment is nowhere to be found. They meet elderly archaeologist Professor Emilia Rumford and her assistant Vivien Fay, who are surveying the site, and learn that the circle appears to have had a variable number of stones over the years.

The TARDIS arrives on contemporary Earth, where Sarah comes into contact with what appears to be a fossilised human hand. This is in fact the last surviving fragment of a Kastrian called Eldrad, who was blown up in space as a punishment for attempting to wipe out his own people.

The TARDIS arrives on an apparently deserted and deactivated space station Nerva, otherwise known as the Ark, orbiting Earth in the far future. There the Doctor, Sarah and Harry discover the last survivors of the human race held in suspended animation, Earth having been evacuated thousands of years earlier when solar flares threatened to destroy all life.

The search for the Key to Time lands Dr. Who and Romana on a moon inhabited by swamp people---and a gigantic monster. Dr. Who: Tom Baker. Fenner: Philip Madoc. Romana: Mary Tamm. Thawn: Neil McCarthy. Dugeen: John Leeson. Rohm-Dutt: Glyn Owen.

The TARDIS is temporarily captured by the Mandragora Helix, a spiral of energy with a controlling influence, at the centre of which the ship is infiltrated by a sparkling ball of energy.

A Dalek fleet surrounds a lone rebel ship, and only the Doctor can help them. With the Doctor facing his greatest enemy, he needs Clara.

The Time Lords send the Doctor to a Skybase above the planet Solos in the 30th Century. The Marshal of the Skybase is determined to prevent Solos achieving independence from Earth. Compiles episodes 5 through 9 from "Doctor Who" series 9.

The TARDIS is infiltrated by the Swarm - a space-borne intelligence that wishes to spread itself across the universe - and the Doctor is infected by its nucleus. The ship then materialises on Titan, one of the moons of Saturn, where the human occupants of a refuelling station have also been taken over.

The Time Lords send the Doctor to a Skybase above the planet Solos in the 30th Century. The Marshal of the Skybase is determined to prevent Solos achieving independence from Earth. Compiles episodes 17 and 18 from "Doctor Who" series 9.

The Doctor and Adric learn from the wizened Keeper of Traken that a great evil has come to his planet in the form of a Melkur - a calcified statue. The Keeper is nearing the end of his reign and seeks the Doctor's help in preventing the evil from taking control of the bioelectronic Source that is the keystone of the Traken Union's civilisation..

The Time Lords send the Doctor to a Skybase above the planet Solos in the 30th Century. The Marshal of the Skybase is determined to prevent Solos achieving independence from Earth. Compiles episodes 19 and 20 from "Doctor Who" series 9.

The Doctor meets his match when he is summoned to Tigella, a planet whose energy source has become unstable. Tom Baker, Lalla Ward. Earthling: Christopher Owen. Zastor: Edward Underdown. Caris: Collette Gleeson. Brotodac: Frederick Treves.

The Doctor investigates when, near the island on which the Master is incarcerated, giant lizards begin attacking ships.

Separated from the Doctor, Clara discovers a new menace from another dimension. But how do you hide when even the walls are no protection? With people to save and the Doctor trapped, Clara comes up against an enemy that exists beyond human perception.

One morning in every city and town in the world, the human race wakes up to face the most surprising invasion yet. Everywhere, in every land, a forest has grown overnight and taken back the Earth.

In the world of the Nethersphere, plans have been drawn. Missy is about to come face to face with the Doctor, and an impossible choice is looming. "Death is not an end" promises the sinister 3W but, as the Doctor and Clara discover, you might wish it was.

With Cybermen on the streets of London, old friends unite against old enemies and the Doctor takes to the air in a startling new role. Can the mighty UNIT contain Missy? As the Doctor faces his greatest challenge, sacrifices must be made.

A Dalek fleet surrounds a lone rebel ship, and only the Doctor can help them. With the Doctor facing his greatest enemy, he needs Clara.

Part 1. "Where is the Doctor?" When the skies of Earth are frozen by a mysterious alien force, Clara needs her friend. But where is the Doctor, and what is he hiding from? As past deeds come back to haunt him, old enemies will come face-to-face.

Part 2. Trapped and alone in a terrifying Dalek city, the Doctor is at the heart of an evil Empire; no sonic, no TARDIS, nobody to help. With his greatest temptation before him, can the Doctor resist? And will there be mercy?

When Robots threaten Sherwood forest, the Doctor helps Robin Hood to stop the evil Sheriff of Nottingham.

Clara is alone in Victorian London with a man she doesn't know, a dinosaur in the Thames, and a spate of deadly spontaneous combustions. The Doctor has changed. It's time you knew him.