In the third episode of the four-part story "Terror of the Autons," the Doctor (Jon Pertwee) comes face to face with his old enemy, the renegade Time Lord known as the Master (Roger Delgado). Relishing the moment, the Master gleefully reveals his scheme to reawaken the Nestene Consciousness (the antagonist of the previous season's adventure "Spearhead From Space") and thereby take over the world. Knowing that the Master is savvy to his arsenal of Time Lord trickery, the Doctor must rely upon other methods to save Mankind. Written by Robert Holmes, "Terror of the Autons, Episode 3" originally aired on January 16, 1971. ~ Hal Erickson, Rovi