The Muppets on Puppets

The Muppets on Puppets is a 1970 TV special created by Jim Henson. The special was produced in June 1968 at public television station WITFTV in Hershey, Pennsylvania for National Educational Television now PBS. It aired on New Yorks WNET on January 5, 1970 as part of the stations Adventure in the Arts anthology series. Henson and company made three additional specials in color as part of the series at WITFTV. The special is included as a bonus feature on the DVD set The Muppet Show Season Three. This release includes a few audio dropouts due to the video source.

Source: Wikipedia