The Great Space Elevator is a marvel of human engineering. When power is lost, the Doctor, Jamie and Victoria take a one-way trip on the elevator, and find themselves confronted by an alien force that threatens to bring chaos on Earth…
Two prisoners meet in a prison cell. Zara is searching for the Key to Time; she was only born yesterday but already she's killed hundreds of people. Ace is more ambitious: she was going to kill everyone on the planet...
Freak weather conditions in London, and UNIT are called in to find the cause. Meanwhile, a street magician entertains crowds in Covent Garden. When Jo Grant and Mike Yates investigate, they discover an enemy with terrifying powers...
While investigating a temporal anomaly in London, the Doctor and Jo Grant meet Professor Harold Saunders, a man who possesses an alien artefact, and is haunted by the ghosts of dolls. What is retrocausation, and who is the mysterious Mrs Killebrew?
The TARDIS lands aboard the Earth Benchmarking Vessel Nevermore, where Captain Rostrum is navigating by punching holes in the very fabric of space. The Doctor is fearful that it could unleash monsters from the dark dimensions.
While investigating a debris-littered battlefield, the TARDIS crew are salvaged by an ancient race of collectors known as Dar Traders. Separated from the Doctor, Adric, Tegan and Nyssa find themselves at the mercy of the Traders' curiosity.
A body is found on the banks of the Thames, but the post mortum reveals that it is actually a wooden mannequin. A deadly scheme is afoot, and only Henry Gordon Jago and Professor George Litefoot can stop Dr Tulp's dastardly machinations...
The Doctor and Leela arrive on Synchronis, a world renowned for peace and civility. But an attack by a vicious creature leaves the Doctor in a coma, and Leela is persuaded to fight in the Empathy Games, where she discovers that nothing is as it seems.
1929, Antibes. While the Doctor practises his painting, Romana attempts to fend off the playful advances of young Tommy Creighton. What is the secret of the cave on the beach? And why do some of Romana's new acquaintances suddenly behave so strangely?
1770, and Captain Cook and his crew are navigating the Pacific Ocean. Into their midst come strangers: the Doctor and Ian Chesterton, who are believed to have come from Venus. But could it be that the travellers are not the only visitors from the stars?
February, 1944: France is occupied by the Third Reich. Trapped in one of the darkest times in history, Polly resolves to make a difference - even if it means leaving the Doctor forever...
There's a house across the waters at Ely where an old woman tells a strange story. About the follies of youth and selfishness, and the terrible things even the well-meaning of us inflict on each other. Hear the old woman's story. Then decide her fate.