The science fictiongenre has produced at least one masterpiece in every decade since the 1920s, and the best films have come to define their respective eras. Sci-fi is as old as cinema itself, and has ...

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His CIA code name is Condor. In the next seventy-two hours almost everyone he trusts will try to kill him.

We asked our readers to name their favourite films in the sci-fi genre – and these were the titles that came up most often.