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In the conclusion of the five-part story "The Dominators," the Doctor (Patrick Troughton) is able to free himself and Jamie (Frazer Hines) from the Dominators' clutches. He must now make a final, desperate effort to prevent the Dominators and their Quarks from destroying the planet Dulkis. The success of this effort hinges upon the willingness of the Dulcians to forego their pacifistic credo and take up arms against their enemies. Written by Mervyn Haisman and Henry Lincoln under the joint pen name Norman Ashby, "The Dominators, Episode 5" first aired on September 7, 1968.