The Cube is Jim Henson’s little-known proto-Black Mirror masterpiece

Jim Henson's 1969 teleplay 'The Cube' is a lesser-known, mind-bending work that explores mature subject matter, showcasing Henson's experimental style. It aired on NBC's 'Experiment in Television' series, which featured various experimental content. The Cube is a 53-minute 'bottle film' that stands out among other oddities in the series. It's worth checking out for fans of Henson's work and those interested in experimental television. The full story can be read at The Verge.