Doctor Who: Genesis of the Daleks (TV)

One of the most famous adventures from the entire series. The Time Lords intercept the Doctor, Sarah and Harry and send them to Skaro in the distant past, in order to prevent the creation of the Daleks. There they discover that the planet's two races, the Kaleds and the Thals, are nearing the climax of the Thousand Year War. As the conflict reaches its terrible conclusion, Sarah discovers that a disfigured Kaled scientist named Davros has already accomplished what the time travellers were sent to stop: the genesis of the Daleks.