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...

South Africa in the 60s. The campaign of sabotage is halted and the arrests continue. The Special Branch obviously have inside Information.

Along with a newlywed couple on honeymoon, music group 4 Jacks and a Jill get involved with a diamond thief and his wife.