Julie Andrews and Stan Mooneyham host this hour-long infomercial for WorldVision, which is a little more grim than happy (as opposed to what the ad states - see below). The Muppets appear around the middle:
On a farm setting, Brewster (a farmer this time, but still a "philosopher"), converses with Stan Mooneyham, which leads into a song, "The Chain of Life," featuring the Choir, as well as Rover Joe the Hound Dog, T.R. and Catgut (and some Muppet chickens) from The Muppet Musicians of Bremen.
Then Kermit tells a story of the sun-deprived Kingdom of Phumph, which consists only of a king, a queen, a prince, and one subject, a young multi-tasker named Marvin (the same puppet as Leo from the Muppet Meeting Films), who becomes king by adopting a doorstep child, thus making the sun shine in the kingdom.
Finally, Kermit sings "If I Ruled the World" while sitting on top of a globe.