Which Muppets appeared in every episode of "The Muppet Show"?

It’s kind of wild how well a show that is ostensibly strange as "The Muppet Show" did. Running for five seasons over 120 episodes, it became so popular that potential guest stars started reaching out to the show wanting to appear, rather than the other way around. They even had a full on "Star Wars" themed episode.

The variety show format provided plenty of absurdist humor, parodies, and of course, popular guest stars of the time. From 1975 to 1981 and for years afterward in syndication (and down on Disney+), people of all ages came to love the show. 

It could have easily run for many more seasons, but Jim Henson felt he had accomplished everything he had wanted to with the show, so he decided to move on and the show ended. Across all the sketches and skits, only two Muppets appeared in every single episode. Who are they?

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