A few months
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The Time Lords send the Doctor, Sarah and Harry to Skaro before the Daleks were created and charge the Doctor with preventing their development. On Skaro, the Kaleds and Thals have been at war for a millennium, and caught up in a Thal attack the Doctor and Harry are taken prisoner by the Kaleds whilst Sarah is lost in a no-man's-land. There, she witnesses the testing of a Dalek, before being captured by the Thals to work on their rocket. Later, the Doctor and Harry encounter the Kaleds' scientific corps, led by Davros, a crippled scientist artificially kept alive. Davros has developed the ultimate mutation of the Kaleds, removed humanising emotions and housed it in a “Mark III travel machine” which he christens a Dalek …