Ko Sho Blo! Trigger-happy space police the Judoon are targeting 21st-century Gloucester. The Doctor, Yaz, Ryan and Graham race back to Earth in order to prevent them doing too much damage to the cathedral city.

The Doctor encounters a living energy structure known as the Mandragora Helix in 15th century Italy. Now he must fight against a sinister cult with plans to use the Mandragora to swallow up the moon and enslave all of mankind.

The Sixth Doctor is forced to land the TARDIS aboard a Gallifreyan space station, where he is brought into a courtroom. The Inquisitor informs the Doctor he is on trial for conduct unbecoming a Time Lord; evidence will be presented by the Valeyard.

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 Doctor will be crushed to death.

The Doctor uncovers the Dodecahedron's secret.

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