Shortly after 8 p.m. on October 30th, 1938, the voice of a panicked radio announcer broke in with a news bulletin reporting strange explosions taking place on the planet Mars, followed minutes later by a report that Martians had landed in the tiny town of Grovers Mill, New Jersey. It turned out to be H.G. Wells' classic 'The War of the Worlds', performed by 23-year-old Orson Welles. Although most listeners understood that the program was a radio drama, the next day's headlines reported that thousands of others plunged into panic, convinced that America was under a deadly Martian attack. 75 years after the original radio broadcast, 'American Experience' examines the elements that came together to create one of the biggest mass hysteria events in U.S. history.