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In the fourth episode of the five-part story "The Dominators," the denizens of the peaceful planet Dulkis debate over whether or not to defend themselves against the Dominator invasion. Meanwhile, the Doctor (Patrick Troughton) is captured by the villains' warriors, the Quarks. He is then given a daunting choice: Either betray his companion, Jamie (Frazer Hines), or suffer a horrible demise. Written by Mervyn Haisman and Henry Lincoln under the joint pen name Norman Ashby, "The Dominators, Episode 4" first aired on August 31, 1968.