Arriving on the barren world of Androzani Minor, the Doctor and Peri find themselves embroiled in a long running, literal underground war. At the heart of the conflict is a substance called Spectrox - both valuable and deadly! The Doctor & Peri wind up being poisoned by the material, which is killing them slowly and painfully unless they can find a cure. As the conflict heats up and the situation gets more desperate, the Doctor realises time is running out - both for Peri and himself...

Kate, a young girl under psychiatric examination, suffers from a lack of confidence, self-esteem and self-control – telling of the “bad Kate” who commits immoral acts. Could the hypocrisy, selfishness and weakness of those around her have led to this state of mind or can Kate simply be diagnosed and dismissed as a schizophrenic?

On the jungle planet Spiridon, the Doctor, Jo and a Thal group find a slumbering army of Daleks ready to awaken.