A little collection of Muppetry for Jim Henson’s birthday. The Skeksis speak their own language in The Dark Crystal. Kermit sings, “Once in a Lifetime.” Mating rituals on Koozbane. Vincent Price sings with Uncle Deadly. Alice Cooper sings “Welcome to My Nightmare.” Martians discover the earth.  Gonzo’s going to go back there someday. The Swedish Chef, Beaker and Animal perform, “Habenera.” It’s not easy being green.