Synopsis by Hal Erickson
In the conclusion of the seven-part story "The Evil of the Daleks," the Doctor (Patrick Troughton) and his companions have been transported to the Dalek home city of Skaro. From here, the villains hope to mount an assault on Earth, armed with the "human factor" of unpredictability, which they believe will enable them to triumph. Even worse, it appears as though the Doctor has become a Dalek himself. With this episode, Deborah Watling became a series regular in the role of Victoria Waterfield. Written by David Whitaker, "The Evil of the Daleks, Episode 7" was first shown on July 1, 1967, as the final episode of Doctor Who's fourth season.