The Twin Dilemma The planet Jaconda has been conquered by the Gastropods. Their leader, Mestor, kidnaps genius twins, Romulus and Remus, as part of his plan to spread Gastropod eggs throughout the universe. In the TARDIS, the newly regenerated Doctor is adjusting to change... Attack of the Cybermen In 1985, Halley's comet approaches Earth. Arriving in London, the Doctor and Peri discover that Cybermen from the future intend to use the comet to destroy the Earth and change the course of history. Vengeance on Varos Requiring the rare mineral Zeiton-7 to repair the TARDIS, the Doctor and Peri arrive on the planet Varos. There they unwillingly become contestants on the colony's barbaric reality TV show, in which prisoners are tortured and executed.