Chancellor Ortron sentences the Doctor and Sarah to be punished by Aggedor.
The apparition disappears after killing Blor. The Doctor and Gebek make a deal, but guards appear. Meanwhile, Sarah has learned there was an explosion in the caverns and comes in search of the Doctor. The Doctor and the miners defeat the guards. Sarah, lost in the tunnels, finds a closed room (the refinery), and accidentally triggers a defence system.
The Doctor convinces Gebek that the miners should return to work, but Ettis still plans an attack. Eckersley, the senior Federation engineer on Peladon, and Alpha Centauri rescue Sarah. She is unable to convince them there was somebody in the refinery.
Ortron convinces Thalira that the Doctor is in league with the miners and must be executed. Ettis attacks Eckersley and takes Sarah and Alpha Centauri to the control room to open the armoury doors. Other miners attack guards in the passageway. They reach the armoury.
Ettis takes Sarah with him as a hostage, but she escapes only to be caught by guards. Ortron orders her taken to the Temple. Ettis and the miners return to the tunnels, and Gebek promises the Doctor to keep an eye on them. The Doctor arrives at the Temple. Ortron has the Doctor and Sarah thrown into the Temple’s pit, where a very real Aggador is waiting for them.