When the Doctor returns to Gallifrey, he learns that his bio data extract has been stolen from the Time Lords' master computer, known as the Matrix. The extract is a detailed description of the Doctor's molecular structure which, in the wrong hands, could be exploited with disastrous effect. The Gallifreyan High Council believe that anti-matter will be infiltrated into the universe as a result of the theft. To avoid this, they decide the Doctor must die. But an old enemy is waiting in the wings.

The TARDIS materialises on a spaceship at the edge of the known universe, and the Doctor, Leela and K9 encounter a group of astronauts searching for the lost gene bank of the Minyan race. The craft plunges into the heart of a recently formed planet, wherein the Doctor discovers an awesome secret: the descendants of a previous Minyan expedition have become enslaved to a powerful computer!

When the TARDIS materialises inside a rocket, the Doctor and Jamie are alarmed by the presence of a hostile Servo-Robot. They discover that the rocket is drifting in the orbit of a giant space station - the Wheel in Space. Once inside the magnificent spaceship they are bewildered by its complexity and sheer size. The technicians and programmers are highly trained, but who are they working for?

On the planet Tigella, the Savants and the Deons are irrevocably opposed on one crucial issue: the Dodecahedron, mysterious source of all their power. To the Savants, it's a miracle of science to be studied and used to benefit all. To the Deons, it's a god, and not to be tampered with. When the power source begins to fluctuate, the whole planet is threatened. Zastor, Tigella's leader, welcomes the Doctor and invites him to arbitrate; yet the Time Lord may not be all he seems.

The huge, octopus-like Kroll lives deep in the swamps of the humid, steamy planet Delta Three. To the native swamp-warriors, Kroll is an angry mythical god. To the money-grabbing alien technicians, it is a threat to their profit-making scheme. When the Doctor and Romana arrive, in search of another segment of the Key to Time, they have to face the suspicion of the lagoon dwellers, the stupidity of the technicians and, finally, the power of Kroll itself.

Assailed by violent bolts of energy, the TARDIS is blasted off-course and forced to land on the barren planet of Lakertya. The turbulence triggers the Doctor's sixth regeneration - but that is the least of his worries. Why has the Rani, that ruthless renegade Time Lady, brought the Doctor to Lakertya? What are the hideous Tetrap guards? Who are the 11 geniuses she has imprisoned in her stronghold, and what is the vital significance of Strange Matter? Aided by the faithful Mel, the Doctor must do all he can to stop the Rani's diabolical scheme before it affects the whole of creation.

Landing on a distant planet, the Doctor confidently announces to his companions that the TARDIS has brought them to an age of great advancement, peace and prosperity. The Doctor's calculations seem to be confirmed when the travellers are greeted by Jano and the Elders, who take them on a tour of their city - a haven of beauty, harmony and friendship, set in a wilderness inhabited by tribes of savages. But the security of the city is founded on one deadly and appalling secret. 

It's December 1999 and strange things are happening as the new millennium nears. A British police box appears from nowhere in San Francisco’s Chinatown and the mysterious man inside it is shot down in the street. Despite the best efforts of Dr Grace Holloway, the man dies and another stranger appears, claiming to be the same person in a different body: a wanderer in time and space known only as the Doctor. But the Doctor is not the only alien in San Francisco. His deadly adversary the Master is murdering his way through the city and has taken control of the TARDIS.

Anneke Wills reads an exciting novelisation of a classic TV adventure for the Second Doctor. When the TARDIS lands on a deserted volcanic island, the Doctor and his companions find themselves kidnapped by primitive sea-people. Taken into the bowels of the Earth, they discover they are in the lost kingdom of Atlantis. Offered as sacrifices to the fish-goddess, Amdo, the Doctor and his companions are rescued from the jaws of death by the famous scientist Zaroff.

The TARDIS lands in a primeval forest, and the Doctor meets Leela, a warrior banished from her tribe. He learns that an ongoing war between the Sevateem and the Tesh was instigated by Xoanon, the god they both worship. In reality, an all-powerful computer, Xoanon, is possessed by a desperate madness directly related to the Doctor - one which only the Time Lord can rectify! In order to do battle with Xoanon, the Doctor must escape, not only from the savage practices of the Sevateem but also from the mind-controlling impulses of the Tesh. 

The TARDIS lands in the Lancashire village of Bilehurst Cragg in the 17th century, and the Doctor, Ryan, Graham and Yaz soon become embroiled in a witch trial run by the local landowner. Fear stalks the land, and the arrival of King James I only serves to intensify the witch hunt. But the Doctor soon realises there is something more sinister than paranoia and superstition at work. Tendrils of living mud stir in the ground, and the dead lurch back to horrifying life as an evil alien presence begins to revive.

Something ghastly is afoot in Victorian Yorkshire. Something that kills. Bodies are washing up in the canal, their skin a waxy, glowing red...but just what is this crimson horror? Madam Vastra, Jenny and Strax are despatched to investigate the mystery. Strangely reluctant to assist their enquiries is Mrs Winifred Gillyflower, matriarch of ‘Sweetville’, a seemingly Utopian workers’ community. Why do all roads lead to the team's old friends Clara and the Doctor? Who is Mrs Gillyflower's mysterious silent partner Mr Sweet?  

In response to the White Guardian's warning of great danger, the TARDIS materialises on the heaving deck of an Edwardian racing yacht. But the Doctor soon discovers that this is no ordinary yacht - and no ordinary race. Captain Striker is competing for an unusual prize: 'Enlightenment'. The crew will be lucky to reach port safely. But with such a prize, would they be lucky to win? Steven Pacey reads Barbara Clegg's complete and unabridged novelisation of her own TV adventure, first published by Target Books in 1984. 

It's 1794, and the TARDIS materialises some distance from Paris during the French Revolution, the scene of the infamous Reign of Terror. Soon the Doctor, Susan, Ian and Barbara find themselves caught up in the tangled web of historical events. Who is James Stirling, the master-spy to whom Ian must deliver a message? What world-shattering events are being discussed in a deserted inn off the Calais road? And can the Doctor and his friends escape a violent and bloody death at the dreaded guillotine? 

The Doctor and Rose arrive in an underground vault in Utah in the near future. The vault is filled with alien artefacts. Its billionaire owner, Henry van Statten, even has possession of a living alien creature, a mechanical monster in chains that he has named a Metaltron. Seeking to help the Metaltron, the Doctor is appalled to find it is in fact a Dalek - one that has survived the horrors of the Time War just as he has.