The Doctor and Adric learn from the wizened Keeper of Traken that a great evil has come to his planet in the form of a Melkur - a calcified statue. The Keeper is nearing the end of his reign and seeks the Doctor's help in preventing the evil from taking control of the bioelectronic Source that is the keystone of the Traken Union's civilisation.

The Doctor, Susan, Ian and Barbara are confused and disorientated after an explosion shakes the TARDIS and the doors open to reveal only a white void.

Dr. Who and Romana (Lalla Ward) land on Chloris, a planet rich in plant life but poor in metal resources. Adrasta: Myra Frances. Karela: Eileen Way. Huntsman: David Telfer. Voice of K9: David Brierly.

The TARDIS is hijacked in the vortex by a time sensitive Tharil named Biroc, and brought to a strange white void. Biroc wants to free the others of his race who are being transported in a slave ship, captained by Rorvik, which is also trapped in the void. The only other thing present in the void is an ancient gateway leading to a decrepit banqueting hall.

Mistaken identity involves the Doctor in intergalactic intrigue.

Dr. Who is framed.

The Doctor (Peter Davison) and Peri are poisoned by a sticky substance they encounter on the planet ofu Androzani Minor. Peri: Nicola Bryant. Stotz: Maurice Roëves.

Part 1. Harry Saxon becomes Prime Minister, but has dark ambitions.

Part 2. With The Doctor imprisoned by The Master, Martha endeavors to save the world.

Kylie Minogue joins Doctor Who to play Astrid, a waitress on a doomed spaceship that eerily resembles the Titanic. When a meteor hits, Astrid and The Doctor must protect the survivors from and prevent the whole ship from crashing to Earth.

The Time Lords intercept the transmat beam taking the Doctor, Sarah and Harry back to Nerva and deposit them instead on the planet Skaro at an early point in its history. There a Time Lord gives the Doctor both a mission to prevent or alter the Daleks' development so that they become less of a threat to the universe and a time ring that will enable him and his companions to return to the TARDIS once this is done.

The Time Lords intercept the transmat beam taking the Doctor, Sarah and Harry back to Nerva and deposit them instead on the planet Skaro at an early point in its history. There a Time Lord gives the Doctor both a mission to prevent or alter the Daleks' development so that they become less of a threat to the universe and a time ring that will enable him and his companions to return to the TARDIS once this is done.

The Doctor, Sarah and Harry return to Earth in response to the Brigadier's summons. UNIT are investigating a series of attacks on North Sea oil rigs and have set up a temporary HQ in the Scottish village of Tullock. The attacks are the work of a huge cyborg, the Skarasen, controlled by a group of aliens called Zygons whose spaceship lies at the bottom of Loch Ness.

The TARDIS picks up a distress call and the Doctor and Sarah arrive on the planet Zeta Minor. There they discover that a Morestran geological expedition has fallen prey to an unseen killer and only the leader, Professor Sorenson, remains alive.

Donna is determined to find the Doctor, even if it means braving Miss Foster and her hordes of Adipose.

In Wales, items include a "Dr. Who" script and pottery.

The Doctor and Donna visit Pompeii in AD 79, on the eve of the eruption of Mount Vesuvius.

The Doctor takes Donna to her first alien world, but the Ood-Sphere reveals some terrible truths about the human race.