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The night before Halloween in 1938, 23-year-old Orson Welles and his Mercury Theatre on the Air performed a radio adaptation of HG Wells’s The War of the Worlds.

It would become one of the most notorious radio broadcasts in history. In their own words, from the ÃÛÑ¿´«Ã½'s archive, Orson Welles, producer John Houseman and writer Howard Koch describe how it was "a very boring show" until they had the idea to update the science fiction story, using reportage and the name of a real location in New Jersey in the United States, as the scene for where aliens from Mars would invade.

Up to six million people tuned in, most of whom had no idea that what they were listening to was fictional. It prompted mass panic. Orson Welles delights in recalling "Suddenly everyone started driving at 125 miles per hour," saying, "I'm going to the hills". Produced and presented by Josephine McDermott.

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(Photo: Orson Welles rehearsing The War of the Worlds. Credit: Bettmann/Getty Images)