This episode is referred to in Jim Henson: the Works as a “key moment in season two, and in the entire history of the Muppets.” News that Rudolf Nureyev — the world’s most famous ballet dancer — would be appearing on the show “generated unprecedented press coverage and audience curiosity.” By season three, the show would have no more trouble attracting guest stars
Kermit explains that in “Swine Lake,” a beautiful princess has been turned into a pig by the wicked magician Trichinosis. The handsome prince, as played by Rudolf Nureyev, has not heard of the change. The portion of this “classic ballet” has Rudolf discovering what has occurred as he dances with the Ballerina Pig.
Rudolph Nureyev at Muppet Show