and knows the man to be cruel and sadistic. The Doctor is more concerned with the fact that people are tampering with a Dalek Artefact, as the Daleks always leave behind traps for the unwary. At Haldoran’s castle, they meet Estro, whom the Doctor instantly recognizes as the Master in a former incarnation, the one the Third Doctor fought most often, and the Doctor realizes that, by backtracking Susan’s call, he has broken a law of time and encountered the Master “out of order”. The Master reveals that he has set Haldoran and London against each other to amuse himself while he waits for DA-17 to be opened. Haldoran believes that the Master is getting his Dalek weapons from DA-17, but in fact he is supplying Haldoran from a private cache of his own and intends to open DA-17, since he has learnt of a powerful secret weapon inside which he intends to seize. Susan manages to escape from her guards and break into the mine workings around DA-17, but is too late to stop the technicians from completing their work. By supplying DA-17 with power the Master was hoping to decode the security locks keeping the Artefact sealed, but in fact he has supplied it with enough power to begin manufacturing new Daleks from its store of raw minerals and Dalek embryos. The Daleks emerge, capture Susan and transform the Master’s guards and technicians into Robomen. Susan is left alive for questioning, but manages to escape from her Roboman guards and get to the heart of the Dalek Artefact. There, the Master materializes in his TARDIS and reveals that the Daleks have created a matter transmuter capable of transforming any element into any other element; he intends to use it as a weapon, holding civilisations hostage to his demands for power. The Doctor, David and Donna overpower their guards and try to get past Haldoran to destroy his cache of Dalek weapons, but Haldoran sees through them and recaptures them. At that moment Tomlin arrives and tries to kill him, and although Haldoran kills Tomlin, Donna takes advantage of the distraction and shoots Haldoran as well. Barlow returns, having successfully conquered London with his Dalek guns; Lord London’s men killed him when he refused to surrender. The Doctor, learning that all communication has been lost with the Master’s men at DA-17, manages to convince Barlow that something has gone