- Jim Henson
- Nigel / George Washington / Swedish Chef / Dr. Teeth / Waldorf / Kermit the Frog / Rowlf the Dog / Youknow Bird / Green Heap / Ernie Girl / Hudson (voice)
- Frank Oz
- Animal / Sam the Eagle / Theodore Roosevelt / Forcryingoutloud Bird / Ruler / Purple Heap / Bert / Pig / George the Janitor (voice)
- Jerry Nelson
- Sgt. Floyd Pepper / Thomas Jefferson / Dancers / Announcer / Statler / Whaddayasay Bird / Melg / Envy / Pencil / Gluttony / Gene Shalit / Dr. Nauga / Sloth (voice)
- Richard Hunt
- Crazy Harry / Ohboy Bird / Pig / Lust (voice)
- Dave Goelz
- Avarice / Zoot / Righton Bird / Brewsters (voice)
- Fran Brill
- Receptionist / Janice / Ohreally Bird / Xomfey / Leafy Green Vegetables / Miss Piggy / Dancer (voice)
- John Lovelady
- Abraham Lincoln / Vanity (voice)
- Rollin Krewson
- Additional Muppets
- Caroly Wilcox
- Additional Muppets
- Jane Henson
- Additional Muppets
