The War of the Worlds was an episode of the American radio drama anthology series Mercury Theatre on the Air. It was performed as a Halloween episode of the series on October 30, 1938 and aired over the WABC Radio network. Directed and narrated by Orson Welles, the episode was an adaptation of H. G. Wells' novel The War of the Worlds.
The first two thirds of the 60-minute broadcast was presented as a series of simulated news bulletins, which suggested to many listeners that an actual Martian invasion was in progress. Compounding the issue was the fact that the Mercury Theatre on the Air was a 'sustaining show' (i.e., it ran without commercial breaks), thus adding to the dramatic effect. Some fled their homes; others were terrified. The news-bulletin format was decried as cruelly deceptive by some newspapers and public figures, leading to an outcry against the perpetrators of the broadcast, but the episode launched Welles to fame.
Professor Richard J. Hand cites studies by unnamed historians who "calculate[d] that some six million heard the CBS broadcast; 1.7 million believed it to be true, and 1.2 million were 'genuinely frightened'". While Welles and company were heard by a comparatively small audience (in the same period, NBC's audience was an estimated 30 million), the uproar was anything but minute: within a month, there were 12,500 newspaper articles about the broadcast or its impact, while Adolf Hitler cited the panic, as Hand writes, as "evidence of the decadence and corrupt condition of democracy."
Later studies suggested this "panic" was less widespread than newspapers suggested. During this period, many newspapers were concerned that radio, a new medium, would make them defunct. In addition, this was a time of yellow journalism, where newspapers were not held to the same standards as today. As a result, journalists took this opportunity to demonstrate the dangers of broadcast by embellishing the story, and the panic that ensued, greatly.
Many listeners were apparently confused. It must be noted that the confusion cannot be credited entirely to naïveté. Though many of the actors' voices should have been recognisable from other radio shows, nothing like The War of the Worlds broadcast had been attempted in the United States, so listeners were accustomed to accepting newsflashes as reliable.
Compounding the problem is that the working script had only three statements concerning the fictional nature of the program: at the beginning, at 40 minutes, and at the end. In fact, the warning at the-40 minutes mark is the only one after the actors start speaking in character, and before Welles breaks character at the end. This structure is similar to earlier Mercury Theatre broadcasts: due to the lack of sponsorship (which often included a commercial message at the 30-minute mark during an hour-long show), Welles and company were able to schedule breaks at will, depending on the pacing of a narrative.