In 2010, Sydney was plagued by chronal waves 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)
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