The TARDIS arrives on the planet Oseidon where the alien Kraals have created an exact replica of the English village of Devesham and its nearby Space Defence Station and populated it with androids in order to rehearse for an invasion attempt. A human astronaut, Guy Crayford, has been duped into collaborating with them.

The TARDIS arrives in the marshes of the third moon of the planet Delta Magna. While trying to get an accurate reading on the tracer, the Doctor is shot at by Thawn and Fenner, two men from a nearby methane refinery.

In the conclusion, the Doctor struggles to control the Key to Time before the computer of Zeos causes total obliteration.

After a meeting in space with a group of unseen aliens the Doctor returns to Gallifrey and claims the presidency of the Time Lords. Leela meanwhile tries to work out why he is behaving out of character. At his induction, the Doctor is 'crowned' with a device giving him access to the Matrix. He then...

A mad scientist is building a Frankenstein-esque body from spare parts to house the disembodied brain of the evil Time Lord Morbius. The only missing piece is the head and the Doctor's could be the perfect fit…

The planet Karn is home both to a mystic Sisterhood, whose sacred flame produces an elixir of life, and to Mehendri Solon, a fanatical scientist who is using the remnants of spaceship crash victims to put together a new body for the still-living brain of the executed Time Lord criminal Morbius.

After a meeting in space with a group of unseen aliens the Doctor returns to Gallifrey and claims the presidency of the Time Lords. Leela meanwhile tries to work out why he is behaving out of character. At his induction, the Doctor is 'crowned' with a device giving him access to the Matrix. He then...

The drill site explodes on the parallel planet and the Doctor (Jon Pertwee) tries to return to Earth to prevent a reoccurrence there. Stahlman: Olaf Pooley. Brigadier: Nicholas Courtney. Liz: Caroline John. Benton: John Levene.

Earth faces an invasion from an army of plastic Autons led by the Doctor's archenemy, The Master.

When a faulty regeneration process causes the Doctor's mind to be disturbed, he retreats to Titan 3---where he inadvertently becomes involved in solving a crime. Colin Baker. Peri: Nicola Bryant. Rommulus: Gavin Conrad.

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.

Part 1. Rose discovers that her father is still alive on a parallel Earth.

Part 2. The Cybermen take control of London and start converting the populace; Jackie falls under Lumic's control; the Doctor, Rose and Mickey are reduced to fugitives.

It is 1953 and the coronation of Queen Elizabeth II is taking place, but beneath the celebrations there are rumours of monsters on the streets.

Part 1. Rose is trapped in the orbit of a black hole; something ancient beneath the planet's surface begins to awaken.

Part 2. As Rose battles the murderous Ood, the Doctor finds his every belief being challenged to the core as the Pit beckons.

The overlap between quantum reality and science fiction is discussed.