On Skaro, the home world of the Daleks, the Doctor encounters the militaristic Movellans - who have come to Skaro on a secret mission - whilst his companion Romana falls into the hands of the Daleks themselves. It soon becomes apparent that the Daleks have returned to their abandoned home city with a crucial objective, one which they hope will give them the advantage in a strategic war. When the Doctor realises what the Daleks are up to, he is compelled to intervene.

A classic TV soundtrack adventure starring Tom Baker. The TARDIS materialises on a planet where the age of prosperity comes often, and precious jewels line the streets like litter. Overseeing the citizens is the bombastic Captain, half human and half machine. Lurking in shadows are the Mentiads, mysterious cowled figures who set their sights on certain individuals and claim them for their own.

The Doctor's old friend and fellow Time Lord Professor Chronotis has retired to Cambridge University - where nobody will notice if he lives for centuries. But now he needs help from the Doctor, Romana, and K-9. When he left Gallifrey he took with him a few little souvenirs - most of them are harmless. But one of them is extremely dangerous. The Worshipful and Ancient Law of Gallifrey isn't a book for Time Tots.It must not be allowed to fall into the wrong hands.

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 hugely powerful Key to Time has been split into six segments, all of which have been disguised and hidden throughout time and space. Now the even more powerful White Guardian wants the Doctor to find the pieces. With the first segment successfully retrieved, the Doctor, Romana and K9 trace the second segment of the Key to the planet Calufrax. But when they arrive at exactly the right point in space, they find themselves on exactly the wrong planet - Zanak.