Sydney was a city located in Australia.
History
According to one account, a group of Daleks based underneath Antarctica captured a nuclear submarine and used it to destroy Sydney. Their plan to use the ruined city as a base from which to convert Humans into slaves and conquer Earth was defeated by the Doctor with the aid of Lt. Davis. (TVA: *Sub Zero)
However, news reports showed Sydney whole again by the time that the Tenth Doctor and the Children of Time thwarted the Dalek plan to move the Earth to the Medusa Cascade and detonate a reality bomb. (DW: Journey's End)
BOSS proposed that, after he conquered the world, they would get the Sydney Orchestra to play at his victory ceremony. (DW: The Green Death)
On 14th July 1993, the Doctor met with 37-year-old Dorothée in a café in Glebe, a suburb of Sydney. (NA: Set Piece)
In 1995, the Doctor, Ace and Bernice Summerfield visited the interdimensional café in Glebe. (NA: Set Piece)
In 1996, the Doctor, Chris Cwej and Roz Forrester visited Sydney for a week. (NA: Return of the Living Dad)
The Doctor bought a beach-house in Sydney while his house in Kent was being painted. (NA: Sleepy)
In 2010, the Tenth Doctor and Majenta Pryce investigated an incident where a Chronal Wave caused the passengers of an aircraft to age several hundred years. (DWM: The Age of Ice)
The Eleventh Doctor, Kazran Sardick and Abigail Pettigrew visited Sydney on Christmas eve. (DW: A Christmas Carol)
In 2096, Sydney was an independent city-state. (PDA: The Indestructible Man)
