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In the third episode of the six-part story "The Enemy of the World," the Doctor (Patrick Troughton) impersonates his lookalike, 21st century would-be dictator Salamander (also Patrick Troughton). He does this to penetrate a research station controlled by Salamander's minions, the better to find out if the villain truly is a villain -- and if so, who his most fervent (and dangerous) followers may be. All of this intrigue naturally has an ominous trickle-down effect on the Doctor's traveling companions, Jamie (Frazer Hines) and Victoria (Deborah Watling). Written by David Whitaker, "The Enemy of the World, Episode 3" first aired on January 6, 1968.