Type an actor's name plus the words bacon number into Google and the search engine will do the trivia for you — an Easter egg it added in 2012, by which point the idea that every performer in Hollywood stands within six films of Kevin Bacon had become part of the culture's furniture. The strange thing about the idea is how little of it began with Kevin Bacon. The trail runs back through a Boston stockbroker's mail, a Broadway play, and a Hungarian short story written in 1929.
The earliest known version of the six-degrees idea belongs to Frigyes Karinthy, a Hungarian writer whose 1929 short story Chains describes a party game: pick any person on Earth — a Nobel laureate, a riveter in a Ford factory — and connect yourself to them through a chain of personal acquaintances no more than five links long. Karinthy's characters treat it as proof that the modern world, shrunk by telegraphs, steamships and celebrity, had become intimately small. He was writing fiction, but he had framed, decades early, a genuine question about the structure of human networks.
The scientist who picked the question up was Stanley Milgram. In his 1967 small-world experiment, Milgram mailed folders to hundreds of people in the American Midwest with an unusual instruction: get this document to a target person — a stockbroker living near Boston — but only by passing it to someone you know on a first-name basis, who then does the same. The chains that reached the target were startlingly short, averaging around five intermediaries. The experiment had real limitations, most obviously that many chains simply died en route, and researchers have argued about it ever since. But the headline survived every caveat: roughly six steps, it seemed, could span a continent of strangers.
Milgram never used the phrase six degrees of separation. That coinage was cemented by the playwright John Guare, whose 1990 Broadway play Six Degrees of Separation hangs its story — a con man talking his way into wealthy Manhattan living rooms — on the idea that everyone on the planet is connected by a short chain of acquaintance, a thought its heroine finds both comforting and terrifying. The 1993 film adaptation earned Stockard Channing an Oscar nomination, gave a young Will Smith his first major dramatic role, and — in a detail our data can't resist — co-starred Donald Sutherland, who happens to rank among the most connected actors in our entire co-star graph, with well over a hundred famous co-stars. Casting him in a story about universal connectedness was, in retrospect, extremely on the nose.
The leap from grand theory to movie trivia happened in a dorm at Albright College in Reading, Pennsylvania, in early 1994. Three students — Craig Fass, Brian Turtle and Mike Ginelli — were snowed in and watching Footloose on television; a promotion for The Air Up There, another Kevin Bacon picture, followed, and the trio was struck by the eerie sense that Bacon was in, or one step removed from, everything Hollywood had ever made. They began linking arbitrary actors to him through shared films, wrote to The Jon Stewart Show declaring Bacon the center of the entertainment universe, and appeared on the programme — alongside a bemused Bacon himself — to demonstrate. By 1996 they had a book, and the game had escaped into every video store and college bar in America.
Bacon, famously, hated it at first. He has said he assumed the game was a joke at his expense — a way of saying that a career spent alongside better-billed actors made him Hollywood's ultimate lightweight. The turn came when he recognised that ubiquity was the compliment: the game works precisely because he worked constantly, across genres, with everyone. In 2007 he founded SixDegrees.org, a charitable organisation built on the game's own premise — using networks of celebrity and acquaintance to route money to good causes. The man had become the metaphor, and then put the metaphor to work.
The game also got a computer. In 1996, computer science students at the University of Virginia built the Oracle of Bacon, a website that computed genuine shortest paths through film credits rather than relying on barroom memory. Its findings became lore: the average Bacon number hovers around a mere three, almost nobody credited in Hollywood exceeds six — and Kevin Bacon is not actually the center of the movie universe. Early computations famously crowned the character actor Rod Steiger as a better hub, with hundreds of actors mathematically more central than Bacon. Mathematicians smiled in recognition, having long tracked their own version through paper co-authorship: the Erdős number, named for Paul Erdős — and the deliberately silly Erdős–Bacon number soon followed for the rare souls with both. By 2012, when Google wired bacon number lookups directly into its search results, a dorm-room joke had completed its journey into infrastructure.
Our own graph — around 1.46 million actors across nearly 900,000 films — lets us check the folklore at scale. When we sampled 60,000 pairs of famous actors, more than nine in ten connected within three films, and just 11 pairs out of the entire sample needed all six steps. Humphrey Bogart reaches Margot Robbie in three moves, via Lauren Bacall and Nicole Kidman. The small world of 1929 has only grown smaller: franchises, streaming ensembles and multiverse reunions keep adding shortcuts faster than time can retire them.
Thirty years on, the Kevin Bacon game thrives because it never really needed Kevin Bacon — it needed the thrill of discovering that two distant stars are secretly neighbours. That thrill is now a daily habit. Pathle is the game's most direct descendant: two actors, one shortest chain of shared films, new every day. And Flickle works the same web from the other end, daring you to identify a film from within the same tangle of casts and credits. Karinthy's parlour game, Milgram's folders, three snowbound students — all of it lives on, thirty seconds at a time.
Published 16 July 2026 · Play the daily movie games