S4 E1 • John Denver

John and Kermit have a surprise for the cast; they're all going to Kermits' home the swamp! But even Gonzo, even with his love of the nasty and strange, thinks it's a bad idea and no one is willing to take him up on the offer even when Kermit offers them to go.

Première diffusion : 20 septembre 1979

S4 E2 • Linda Lavin

Miss Piggy announces that this show is Kermit's birthday, and before he can react, she launches into the tribute she's organized. They've planned a This Is Your Life-style show with birthday greetings, including one from Mr. Dawson, Kermit's old acting coach from Leland, Mississippi. Wayne and Wanda, the singing duo from the first season, show up and give Kermit such a guilt trip that he rehires them. When they sing, Kermit remembers why he fired them in the first place.

Première diffusion : 27 septembre 1979

S4 E3 • Shields & Yarnell

Inspired by mimes Shields & Yarnell, Fozzie Bear works on a mime act, including "Bear walking against the wind". Kermit suggests that Fozzie find a more original act, so Fozzie tries out "Bear feeding spaghetti to an elephant" and "Bear going to a drive-in movie with a porcupine".

Première diffusion : 4 octobre 1979

S4 E4 • Crystal Gayle

The Prairie Dog Glee Club sings very well, but Scooter says they have "pack rat blood in 'em -- they keep stealing everything!" The prairie dogs go wild, taking everything Kermit has -- including his collar, which leaves him naked on stage.

Première diffusion : 11 octobre 1979

S4 E5 • Kenny Rogers

During a sketch Kermit hurts himself and keeps getting frightened by jungle animals in his hospital room or injured further by some crazy inconvenience.

Première diffusion : 18 octobre 1979

S4 E6 • Dudley Moore

Dudley has a surprise for Kermit, a robot that can do the work of the entire band and of course the Electric Mayhem feel threatened by this fact.

Première diffusion : 25 octobre 1979

S4 E7 • Victor Borge

When Bobby Benson has to talk to a police officer someone has to take care of his babies. Unfortunately, the babies go wild without their daddy around and beat up people they don't like.

Première diffusion : 1 novembre 1979

S4 E8 • Beverly Sills

The pigs are excited that guest star Beverly Sills plans to perform the opera "Pigoletto" as the closing number.

Première diffusion : 8 novembre 1979

S4 E9 • Liza Minnelli

The Muppets present a murder mystery. Kermit is a private eye hired by Liza O'Shaugnessy, an actress whose production is being terrorized by a killer. The director, Fritz (Strangepork), is shot. The police assign Patrolbear Fozzie to the case, and he interrogates the cast: "All right, which one of you killed the director?" The suspects are themselves killed one by one, until Kermit and Liza team up to unmask the true killers.

Première diffusion : 15 novembre 1979