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In the second episode of the pivotal four-part story "The Caves of Androzani," the Doctor (Peter Davison) and Peri (Nicola Bryant) have arrived on the planet Androzani Minor -- where, unbeknownst to themselves, their bodies are "invaded" by a supposedly life-prolonging drug called Spectrox. The two time travellers also find themselves trapped in the middle of a three-way battle between hideously deformed mad scientist Sharaz Jek (Christopher Gable), corrupt businessman Morgus (John Normington), and the colonial troops headed by General Chellak (Martin Cochrane). Originally telecast on March 9, 1984, "The Caves of Androzani, Episode 2" was written by Robert Holmes.