Sydney Sydney was a city located in New South Wales , Australia . History . In the 1970s , a group of Dalek s based underneath Antarctica captured a nuclear submarine , the USS " Jefferson " and used it to attack Sydney , destroying Sydney Harbour Bridge . Their plan to use the city as a base from which to convert human s into Daleks and conquer Earth was defeated by the Third Doctor with the aid of Lt Davis . ( COMIC : " * Sub Zero ) " BOSS proposed that , after he conquered the world , they would get the Sydney Orchestra to play at his victory ceremony . ( TV : " The Green Death " ) In 1982 , Tegan Jovanka and Kyle met in Sydney . ( AUDIO : " The Waters of Amsterdam " ) On 14 July 1993 , the Seventh Doctor met with thirty - seven year old Dorothée in a café in Glebe , a suburb of Sydney . ( PROSE : " Set Piece " ) In 1995 , the Doctor , Ace and Bernice Summerfield visited the interdimensional café in Glebe . ( PROSE : " Set Piece " ) In 1996 , the Doctor , Chris Cwej and Roz Forrester visited Sydney for a week . ( PROSE : " Return of the Living Dad " ) In the 20th century , the Doctor , Ace and Bernice visited Sydney . ( PROSE : " Virgin Lands " ) The Third Doctor bought a beach house in Sydney while his house in Kent was being painted . ( PROSE : " Sleepy " ) Sydney was one of ten major cities across the world , all of which had underground railways , where Coldfire Construction built a reactor within a period of 18 months as part of a plot by the Slitheen to drain the Sun ' s energy , operated by at least one Slitheen disguised using a skin suit made from a local . At somepoint in 2008 , after Sarah Jane Smith foiled the Slitheen with the help of her friends at Park Vale Comprehensive School at Ealing in London , she contacted UNIT so they would clear up the Coldfire sites . ( TV : " Revenge of the Slitheen " ) In 2009 , Sydney celebrated the return of Earth from the Medusa Cascade with fireworks . ( TV : " Journey ' s End " ) In 2010 , Sydney was plagued by chronal wave s caused by the SKARDIS which released prehistoric creatures into Sydney and aged the passengers of an aircraft greatly . The Tenth Doctor and Majenta Pryce investigated with UNIT . The last chronal wave the SKARDIS caused before it was destroyed froze parts of Sydney in ice from the Ice Age . According to the Doctor , it would take Sydney years to rebuild and recover from this new Ice Age . ( COMIC : " The Age of Ice " ) At Christmas 2015 , the Pyramid Eternia appeared in Sydney ' s harbour . ( PROSE : " Big Bang Generation " ) In the 2010s , the Cyber - pollen cloud s were above the Sydney Opera House . ( TV : " Death in Heaven " ) The Twelfth Doctor , Nardole and Bill Potts visited Sydney to escape from a sentient oil creature that had been in a puddle . ( TV : " The Pilot " ) In 2096 , Sydney was an independent city - state . ( PROSE : " The Indestructible Man " ) The Eleventh Doctor , Kazran Sardick and Abigail Pettigrew visited Sydney on Christmas Eve . ( TV : " A Christmas Carol " ) Undated events . The swindler Garron attempted to sell the harbour of the city to an Arab and was asked to sell the Opera House . ( TV : " The Ribos Operation " ) Anton Mordillo wanted to give a concert at the Sydney opera house . ( COMIC : " The Great Mordillo " ) References . Clara Oswald had a travel guide to Sydney in her collection . ( TV : " Dark Water " )