The Cube is an hourlong teleplay that aired on NBCs weekly anthology television show NBC Experiment in Television in 1969. The production was produced and directed by puppeteer and filmmaker Jim Henson, and was one of several experiments with the liveaction film medium which he conducted in the 1960s, before focusing entirely on The Muppets and other puppet works. The screenplay was cowritten by longtime Muppet writer Jerry Juhl.
An unnamed man, simply called The Man in the Cube Richard Schaal, is trapped in a cubelike white room as he asks if anyone can hear him. A stool is brought in by a maintenance man named Arnie Hugh Webster who discovers it covered in strawberry jam as he wipes it down. After Arnie leaves, the Man tries to find the door. He encounters a variety of people come through various hidden doors in which each one claim that he can get out through his own door.His first visitor is a woman named Margaret Lolo Farell who claims that the man is her husband Ted as she appears with parents Alice Hill and Moe Margolese are also present. Her door closes on the Man before she can get him out. ........
Source: Wikipedia