The saga of the billion-dollar sock: The Muppets’ 50th birthday marks a long and profitable run

A variety show that’s still revered for its absurdist, slapstick humor debuted 50 years ago. It starred an irreverent band of characters made of foam and fleece.

Long after “The Muppet Show”‘s original 120-episode run ended in 1981, the legend and legacy of Miss Piggy, Fozzie Bear, Gonzo and other creations concocted by puppeteer and TV producer Jim Henson have kept on growing. Thanks to the Muppets’ film franchise and the wonders of YouTube, the wacky gang is still delighting, and expanding, its fan base.

As a scholar of popular culture, I believe that the Muppets’ reign, which began in the 1950s, has helped shape global culture, including educational television. Along the way, the puppets and the people who bring them to life have earned billions in revenue.

Kermit’s origin story

Muppets, a portmanteau of marionette and puppet, first appeared on TV in the Washington, D.C., region in 1955, when Henson created a short sketch show called “Sam and Friends” with his future wife, Jane Nebel.

Their motley cast of puppe...