92 1 Horror of Fang Rock

On the way to show Brighton to Leela, the TARDIS lands on the island of Fang Rock off the south coast of England in the early 20th century. Noticing that the lighthouse isn't functioning properly, the Fourth Doctor decides to investigate, as well as to ask for directions, as the TARDIS seems to have got 'lost in the fog'.

93 2 The Invisible Enemy

Some human space travellers are cruising near the outer planets of the solar system with their ship on autopilot. The TARDIS is travelling through the same region. The crews of both ships are infected by a sentient virus, which chooses The Doctor to be the host of its "mind," the Nucleus of the Swarm. The Nucleus declares Leela a reject and orders her killed.

94 3 Image of the Fendahl

In a priory near the village of Fetchborough, four scientists, Adam Colby, Max Stael, Thea Ransome and Dr. Fendelman, are doing tests on a human skull they found in Kenya, apparently twelve million years old. When Dr. Fendelman starts using a sonic time scan, trying to get an image of the owner of the skull, the skull itself seems to react, locking onto Thea and releasing something in the priory grounds that kills a passing hiker, who eventually totally disintegrates.

95 4 The Sun Makers

The Fourth Doctor and Leela arrive on the planet Pluto just in time to prevent one of its citizens, Cordo, from committing suicide over his energy bill. The monopolistic energy company on Pluto is using its economic stranglehold to extract ever growing taxes and those who refuse to pay are forced to live in the dark tunnels of the Undercity. The Doctor, Leela and Cordo venture to the Undercity, where they encounter thieves and dropouts led by the brutal Mandrel.
 

96 5 Underworld

In the history of the Time Lords, their involvement with the Minyans of Minyos is regarded as a disaster. The Minyans looked on them as gods but, having learnt much from their science, later expelled the Time Lords, who thereafter adopted a policy of non-intervention. The Minyans resented the Time Lords for their dominion over Minyos. Subsequently, the Minyans engaged in a civil war, using the advanced weapons the Time Lords gave them. In the final conflict, the Minyans destroyed their world.
 

97 6 The Invasion of Time

To the confusion of Leela and K9, the Fourth Doctor has a covert meeting with aliens before taking his companions to the Citadel at Gallifrey. Once there, he lays claim to the vacant Presidency as his right by Time Lord law—he is the only candidate, as established in the story The Deadly Assassin. While reviewing the presidential suite, he orders it lined with lead. During his induction ceremony, the Crown of Rassilon seems to reject him, and he's injured. Leela is accused of having attacked him, when in fact she tried to help him, and she's banished from the Citadel.