<P> The Cyberking was a giant robot controlled by the Cybermen and Miss Hartigan in 2008's The Next Doctor . </P> <P> The L3 robot left in charge of a human settlement on Ravalox / Earth after the Time Lords nearly destroyed the planet to hide Matrix secrets . Running solely on black light, a highly volatile substance, Drathro was dependent on an energy - collecting tower, which primitives turned into a totem pole . Tricked by the Sixth Doctor and Sabalom Glitz, Drathro melted away along with the secrets once his power source was destroyed . </P> <P> Gadget was a robot invented and controlled by junior technician, Roman Groom, for the Bowie Base One Mars station . After the Doctor saved Gadget, along with Adelaide Brooke, Mia Bennett and Yuri Kerenski, the robot stopped working due to loss of signal . </P> <P> The Gundans were war robots encountered by the Fourth Doctor in the 1980 story Warriors' Gate by Stephen Gallagher . They were designed by the human slaves of the Tharils and used as a spearhead in the revolution which overthrew the Tharil empire . Designed with the primary purpose to resist and kill Tharils, the Gundans could travel the time winds like their prey and butchered many during the revolt . Each Gundan was armed with an axe and decorated with horns to make the robots seem more frightening . The revolt began on the day of the Great Feast . Several inert and decaying Gundans were found by the Doctor when he visited the feasting hall in the Gateway between the universes . The skeletons of their defeated enemies remained in their seats around the feasting table . The Doctor repaired the memory wafers of a Gundan to discover what had caused the decay of the Gateway . </P>

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