On Halloween night in 1938, Orson Welles's Mercury Theatre aired fake news bulletins about a Martian landing at Grover's Mill, New Jersey; the nationwide hysteria newspapers reported afterward turns out to have been mostly their own invention.

The most famous scare in the history of American radio turns out, on closer inspection, to be largely a scare invented by the newspapers that covered it.

October 30, 2026

Orson Welles opened the broadcast by telling his audience they were about to hear a play, adapted from a forty-year-old English novel, performed by an unsponsored theater company on Sunday-night radio. Most of the people who later called their local police department never heard him say it.

What actually went out over the air that night?

At 8 p.m. on October 30, 1938, CBS carried the seventeenth episode of The Mercury Theatre on the Air, a low-budget anthology series that Welles, then twenty-three, ran with the producer John Houseman. The script, by Howard Koch, adapted H. G. Wells's novel The War of the Worlds, serialized in 1897 and published in book form the following year, moving its Martian invasion from Victorian England to the American present and setting the first landing at Grover's Mill, an actual crossroads hamlet in West Windsor Township, New Jersey. Koch structured the hour as a fictional dance-band broadcast, "Ramon Raquello and His Orchestra" live from a made-up hotel ballroom, interrupted by news bulletins that escalate quickly from an odd flash on Mars to a field reporter, Carl Phillips, describing a metal cylinder buried in a farmer's pit.

From there it moves fast. Phillips narrates creatures emerging from the cylinder and firing a heat ray into a crowd of onlookers; his transmission cuts off mid-sentence into dead air, followed by an announcer explaining, in character, that the broadcast could not continue "due to circumstances beyond our control." Welles himself played Professor Richard Pierson, a Princeton astronomer who narrates the invasion's spread toward New York before the Martians, exactly as in Wells's novel, die from ordinary earthly bacteria they have no resistance to.

Why did anyone mistake it for real news?

Two things did the damage, and neither was intentional. The Mercury Theatre had no sponsor and a small audience; its main competition that hour was NBC's The Chase and Sanborn Hour, the country's most popular program, built around the ventriloquist Edgar Bergen. A significant share of listeners, station-surfing during a musical number on Bergen's show, landed on CBS well after Welles's opening disclaimer and caught the drama already in its news-bulletin format, with no cue that they had tuned into fiction.

The second cause was craft rather than accident: Koch and Welles built the bulletins to sound exactly like the real thing, down to invented-but-plausible officials and a Princeton professor whose title borrowed a real university's prestige. Radio in 1938 was where Americans got breaking news, and a program that used radio's own conventions against itself was always going to fool somebody.

What happened in Grover's Mill itself?

Not much, despite the postcards it later sold on the strength of the story. William Dock, a 76-year-old farmer who lived near the real Grover's Mill, told reporters he grabbed his shotgun after hearing the bulletin and went outside looking for whatever needed shooting; he found nothing, and posed for a New York Daily News photograph two days later holding the gun anyway. The hamlet's water tower, a plain metal cylinder rising over the trees, has been pointed to for decades as something nervous locals supposedly fired on, though the story is told more often than it is documented.

How big was the panic, actually?

Here the record gets genuinely contested, and the honest answer is: much smaller than its reputation. A same-night ratings survey by the C. E. Hooper company found that only about 2 percent of the households it polled were tuned to Welles's broadcast at all; the overwhelming majority were listening to Bergen, to another station, or to nothing. That is not the profile of a program that terrified the nation.

Hadley Cantril, a Princeton psychologist who studied the event within months, put the total audience at roughly six million; of those, he estimated, 1.7 million believed they were hearing a genuine news bulletin, and 1.2 million were frightened enough that the smaller figure has been cited ever since as proof of nationwide hysteria. In 2013, the media historians Jefferson Pooley (Muhlenberg College) and Michael Socolow (University of Maine) revisited Cantril's data for a Slate investigation timed to the broadcast's seventy-fifth anniversary, and found his survey instrument produced panic estimates over 100 percent higher than any other measurement taken that week. Pooley and Socolow also checked the specific anecdotes that had accumulated for decades, from suicides blamed on the broadcast to listeners supposedly rushed to hospitals in a panic. They found no newspaper had ever named a single verified suicide, and a canvass of six New York City hospitals turned up no admissions attributable to the broadcast either.

None of this means nobody was frightened; some listeners plainly were, and a handful of documented, isolated incidents of alarm are real. It means the coast-to-coast hysteria of legend, the version with families fleeing into the streets by the thousands, rests on wire-service anecdotes that were rarely traced back to a named, confirmable person.

So why did the story get so big?

Newspapers had a motive, and Pooley and Socolow argue they used it. Radio was pulling advertising revenue away from print through the 1930s, and a script that let editors cast the upstart medium as reckless and its listeners as gullible was a story worth running past the point the facts supported. Coverage exploded for a day or two and then faded from the front page almost as fast as it had arrived, which is itself an odd trajectory for an event genuinely convulsing the country.

Welles gave the story its human face regardless. He held a press conference at the CBS building the morning after, visibly shaken, fielding reporters who wanted to know point-blank whether he had meant to deceive the public; he insisted he had not, and pointed to the disclaimers broadcast both at the start of the hour and again at the midpoint break. The Federal Communications Commission opened an inquiry and closed it about five weeks later, on December 5, without fining or sanctioning CBS; the network volunteered on its own to stop using simulated news bulletins inside dramatic programming.

What did it actually change?

Welles's career, mostly. The controversy made him a national name overnight, at an age when most directors are still assisting someone else, and RKO Pictures signed him to an unusually generous studio contract not long after. Three years on, in 1941, he wrote, directed, produced, and starred in Citizen Kane, a film that borrowed the same trick that had gotten him in trouble on the radio: building fiction out of the documentary texture of real institutions, this time newsreels rather than news bulletins.

The broadcast's real legacy is less about Martians than about format. Every fake-news scare since (the deepfaked video, the AI-cloned voice on a family emergency call) borrows the same basic con: dressing invention in the conventions an audience already trusts. Welles told the country, more than once, that what they were hearing was a story. It is a lesson that keeps needing to be relearned, in whatever medium happens to be new.