On April 2, 1979, to help promote the upcoming Muppet Movie, Kermit the Frog and the rest of the Muppet gang took over The Tonight Show. As you will see, the show is a Muppet special of sorts. Throughout the show Muppet characters make appearances with notable a very notable appearance by Fozzie during the monologue. Guests appearing in this episode are Vincent Price, Bernadette Peters, Leo Sayer and Dr. Michael Fox.
Here is the full episode posted online complete with original commercials.