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In dire need of the valuable mineral Zyton-7, the Doctor (Colin Baker) and Peri (Nicola Bryant) journey to Varos, a onetime prison colony. Here they discover that the population is held in mental bondage by a network of video screens, which offer a 24-hour diet of televised tortures. Who - or what -- is behind this electronic outrage? Written by Philip Martin, the two-part "Vengeance on Varos" was originally telecast on January 19 and January 26, 1985; the two 45-minute episodes have since been recut into a four-part cliffhanger for American television.