In Victorian London, Dr. Who investigates a murder. First of two parts. Louise Jameson. Weng-Chiang: Michael Spice. Li H'sen Chang: John Bennett.

Conclusion. Tom Baker. Leela: Louise Jameson. Weng-Chiang: Michael Spice. Li H'sen Chang: John Bennett. Jago: {p[Christopher Benjamin}}. Litefoot: Trevor Baxter. Sin: Deep Roy.

The Doctor encounters highly advanced reptiles. Monarch: Stratford Johns. Nyssa: Sarah Sutton. Persuasion: Paul Shelley. Enlightenment: Annie Lambert. Adric: Matthew Waterhouse.

The nucleus of the virus settles in the Doctor's brain. Tom Baker, Louise Jameson. Marius: Frederick Jaeger. Lowe: Michael Sheard. Parsons: Roy Herrick.

The TARDIS arrives on a planet where a savage tribe called the Sevateem worship a god called Xoanon. The Doctor discovers that Xoanon is in fact a spaceship computer that he tried to repair at some point in his past and inadvertently drove mad by giving it a multiple personality.

Dr. Who and Romana are diverted to Alzarius on a voyage home. Dr. Who: Tom Baker. Romana: Lalla Ward. Varsh: Richard Willis. Login: George Baker. Adric: Matthew Waterhouse.

The Swampies offer the Doctor, Romana and Rohm-Dutt as sacrifices to Kroll.

The TARDIS arrives on a planet where a savage tribe called the Sevateem worship a god called Xoanon. The Doctor discovers that Xoanon is in fact a spaceship computer that he tried to repair at some point in his past and inadvertently drove mad by giving it a multiple personality.

The Doctor, Sarah and Harry come across a crew of shipwrecked astronauts after being lured by their fake distress call. The Doctor soon discovers the astronauts are being experimented on by the Sontarans in preparation of a full-scale invasion of Earth.

The Doctor and Romana's search for the Key to Time leads them to warring planets Atrios and Zeos. Tom Baker, Mary Tamm. Shadow: William Squire. Marshal: {p[John Woodvine}}. Princess Astra: Lalla Ward.

The Doctor is invited to visit the planet Tigella by its leader, Zastor, who has become concerned about disputes between his people's two opposing factions, the religious Deons and the scientist Savants. The TARDIS is intercepted by the megalomaniacal xerophyte Meglos, last survivor of the planet Zolfa-Thura, and trapped in a chronic hysteresis - a time loop - but the Doctor and Romana manage to free it.

Part 1 of two. The energy from an atomic-research center awakens a hibernating race of intelligent reptiles. The Doctor: Jon Pertwee. Liz: Caroline John. Spencer: John Newman.

The Doctor works against time to save the Manussians from the power of the Mara. Peter Davison. Tegan: Janet Fielding. Lon: Martin Clunes. Tanha: Colette O'Neil. Dojjen: Preston Lockwood.

Kylie Minogue joins Doctor Who to play Astrid, a waitress on a doomed spaceship that eerily resembles the Titanic. When a meteor hits, Astrid and The Doctor must protect the survivors from and prevent the whole ship from crashing to Earth.

The Doctor join forces with a masked Superhero for an epic New York adventure. With brain-swapping aliens poised to attack, the Doctor and Nardole link up with an investigative reporter and a mysterious figure known only as The Ghost.

Two worlds collide when the Doctor meets Bill. A chance encounter with a girl with a star in her eye leads to a chase across time and space. Bill's mind is opened to a Universe that is bigger and more exciting than she could possibly have imagined.

The language of the future is emoji! The Doctor takes Bill to a spectacular city on a distant planet, but where are the colonists? A band of "cute" droids hold the deadly answer.

London, 1814. The entire city has turned out for the biggest Frost Fair in decades! But beneath the Thames, revelers are disappearing, snatched through the ice. Will the Doctor and Bill stop the slaughter before they too are dragged into the icy waters?

Why do floorboards creak? When a sinister landlord shows Bill and her friends the perfect house-share, they have no idea what lies ahead. Knock knock, who's there?

Space, the final frontier. Final because it wants to kill us. Trapped on a space station with no oxygen, the Doctor, Bill and Nardole are horrified to discover the automated spacesuits keeping them alive are also trying to kill them!

The Veritas. The truth. Truth so true you can't live with it. Is that looking into hell or seeing the light? Everyone who has ever read the Veritas has been found dead.

An 'ancient' pyramid appears overnight. Every clock in the world begins counting down to the Earth's destruction. Three opposing armies lie ready to annihilate each other. It's a terrifying race against time to save the world!

Earth has been invaded and Bill is living alone, an isolated figure surviving in occupied Britain. The Doctor is imprisoned, and appears to be on the side of the enemy, flooding the airwaves with fake news.

'God save the Queen' has been scrawled on the surface of Mars. What are Victorians doing on the home of the Ice Warriors? And what will they find beneath the Martian soil?

A hunt for the lost Ninth Roman Legion leads the Doctor,Bill and Nardole into the middle of an ancient battle that could cast humanity into the dark forever. What is inside the cairn? And how far will they have to go defeat the terrifying Eaters of Light?

A huge spaceship trapped in the gravity well of a black hole, teeming with impossible lifeforms, harbors one of the Doctor's most feared enemies, Mondasian Cybermen!

Can Rose trust a man with a new face? As the newly regenerated Doctor drifts in and out of consciousness, Christmas becomes a time of terror on planet Earth when the whole of mankind falls under the shadow of the sinister alien Sycorax.

The Doctor and Rose board the Tardis and visit mankind's new home but they find gruesome secrets in a luxury hospital.

The Doctor and Rose travel back to 1879, but an encounter in the Scottish Highlands with Queen Victoria and a band of warrior monks reveals a deadly trap.

The Doctor investigates a haunted London school and runs into an old friend.

Madame de Pompadour finds the court at Versailles under attack by sinister clockwork killers and her only hope of salvation lies with the Doctor.

No sooner has the Doctor said a tear-stained farewell to Rose Tyler than he finds himself face-to-face with a woman dressed in a fluffy white wedding frock. Who is she? Who is she supposed to be marrying? And how did she get on board the TARDIS?