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The creator of the 1960s British sci-fi series Thunderbirds died in his sleep on Dec. 26 at the age of 83. He had suffered from mixed dementia for several years. Much of Anderson's work featured the use of modified puppets known "supermarionation." His other credits included The Adventures of Twizzle, Stingray, and Captain Scarlet and the Mysterons. He also launched the live-action series Space: 1999 in 1975.