In the third episode of the pivotal four-part story "The Caves of Androzani," the planet of Androzani Minor continues to be the setting for a three-pronged power struggle between a mad doctor, a corrupt businessman, and an insurrectionist. The catalyst for all the carnage is a drug called Spectrox, which purportedly prolongs life. Both infected with Spectrox, the Doctor (Peter Davison) and Peri (Nicola Bryant) learn to their horror that Spectrox has the exact opposite of the desired effect. Originally telecast on March 15, 1984, "The Caves of Androzani, Episode 3" was written by Robert Holmes. ~ Hal Erickson, Rovi