Some time ago the White Guardian, one of the most powerful beings in the Cosmos, set the Doctor an urgent task to find and reassemble the six segments of the Key to Time. Having successfully retrieved five of the segments, the Doctor and Romana arrive on the planet Atrios in the middle of an atomic war. There they must search for the last, most vital piece of the Key. However, sinister dangers await them in this final stage of their quest. The actions of the Marshal of Atrios, operating under a mysterious influence, look certain to bring about Armageddon for them all.

In present day England, a group of scientists are intent on analysing an impossibly ancient skull. But when the ultra-modern technology of their Time Scanner combines with the ancient evil of Fetch Wood, it brings to life a terror that has lain hidden for twelve million years. Arriving in the TARDIS, the Doctor and Leela must fight to destroy the Fendahl, a recreated menace that threatens to devour all life in the galaxy. Louise Jameson, who played Leela in the BBC TV series, reads this classic novelisation of Chris Boucher's 1977 serial.

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.

An unabridged reading of this classic novelisation of a 1968 TV adventure featuring the Second Doctor, as played on screen by Patrick Troughton. For 40 years the Yeti had been quiet, a collector's item in a museum. Then, without warning, it awoke and savagely murdered. At about the same time, patches of mist began to appear in Central London. People who lingered in the mist were found dead, their faces smothered in cobwebs. The cobweb seeped down, penetrating the Underground System.

The evil Master leered at the Doctor, and triumphantly pointed out of the cabin window. The many-tentacled Nestene monster - spearhead of the second Auton invasion of Earth - crouched beside the radio tower! Part crab, part spider, part octopus, its single huge eye blazed with alien intelligence and deadly hatred... Can the Doctor outwit his rival Time Lord, the Master, and save the Earth from the Nestene horror?