From Muppet Wiki

King Ploobis is the greedy, decadent sovereign of the decaying Land of Gorch in sketches on Saturday Night Live. Ploobis is the husband of Queen Peuta and father of Wisss, and is having an affair with Vazh. Ploobis frequently seeks guidance from The Mighty Favog, and is fond of mistreating his lackey/sidekick Scred.

In the closing credits of one SNL broadcast, John Belushi pulled a knife on Ploobis.