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In the fourth episode of the seven-part story arc "The Daleks," the Doctor (William Hartnell) and his companions are still on the dead planet Skaro, again in the clutches of the mutant Daleks. In attempting to escape, Ian (William Russell) is paralyzed, and the Doctor and Barbara (Jacqueline Hill) are weakened by radiation sickness. It is up to Susan (Carole Ann Ford) to make her way back to the TARDIS in order to return herself and her friends back to the 20th century -- while the Daleks continue formulating their plans for mass destruction. Written by Terry Nation, "The Ambush" originally aired on January 11, 1964.