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Coldstar was a freezer satellite, named after the company which ran it.

It was in orbit around Enyo and gained its ice from a nearby ice planet. The ice, however, contained frozen Ice Warriors from the Ice Warrior Wars. Once they unfroze, they planned to set Coldstar on a collision course to Enyo in revenge, but the Tenth Doctor and Rose Tyler stopped them by changing the course for the nearby sun instead. (AUDIO: Cold Vengeance)