This is a list of minor Muppet projects that have not made it past the development stage, for which not enough information exists to constitute its own page.
Adventures of the Snerf-Poof from Planet Snee
Adventures of the Snerf-Poof from Planet Snee was a proposal for a surrealistic Muppet project made by Jim Henson in the late 1960s.
ASTRO G.N.E.W.T.S. was a proposed concept for a 30-minute television special that could air as the second-half of an episode of The Jim Henson Hour. The special would have blended puppets with animation, computer graphics, and video effects.
The Island of Lost Muppets
Proposed miniseries in the late 1980s that would have introduced new characters called the Orangs. This special was originally going to be titled "Muppetamia". Initially planned to be a four-hour mini-series broadcast on CBS, the network later wanted it to become a two-hour made-for-TV movie before dropping support for the project.
Kermit at the Smithsonian
Kermit's Christmas Capers
Kermit's Christmas Capers was announced as a proposed television special for the 2005 holiday season; however, the project was cancelled before filming due to changes in management with the Muppets Holding Company.
Miss Piggy mystery books
A July, 1990 article in Publisher's Weekly described a merger between Muppet Press with Disney Press in "the impending acquisition of Henson Associates". The article mentioned that "plans are in the works for a line of Muppet Babies toddler books, a Miss Piggy mystery series and a biography of Henson by Louise Gikow."
The Muppet Love Song Album
Muppet Robin Hood
In an interview with Starlog, Brian Henson stated that a first draft of a feature-length version of Robin Hood starring the Muppets had been written, but the company felt that "there had been too many Robin Hoods."
Muppets in Camelot
Muppets in Camelot had been mentioned by the Jim Henson Company many times in the late 1990s, and was "kicked around" for several years for a potential feature film. A script outline was produced, but the film didn't move forward into production.
The Muppets Leave Hollywood
The Muppets Leave Hollywood was an outside script bought by the Henson Company in February 1998. In the script, the Muppets (playing themselves) are living the high life in Hollywood until Kermit decides they've lost their purpose in this greedy world and takes them all back to the swamp.
The Muppets' Run for President
An election special, intended to coincide with the 2008 Presidental election was written by Andrew Samson, Scott Ganz, and Hugh Fink for The Muppets Studio. The writing trio revealed the title and discussed the project, the inital pitch and its ultimate fate in the 89th episode of The MuppetCast. The special followed Miss Piggy's run for the White House (previously the home of President Animal).
Noah's Ark Musical
Following the London musical Doctor Dolittle, the Jim Henson's Creature Shop was approached by the creator of Dolittle, Leslie Bricusse, on a musical based on the story of Noah's Ark. Preliminary work on the creatures was started, but the show was never produced.
Following the 1986 airings of The Tale of the Bunny Picnic on HBO and The Christmas Toy on ABC, the cable channel considered producing more in the series of "picture-book specials". A 1988 article in Channels, a magazine for the television industry, revealed:
“Henson has ten specials in development that he would like to place, including a Valentine's Day program called Puppy Love starring Muppet dogs, and a special called The Lizards for the summer. These will eventually be turned into a series of videocassettes distributed by HA. And the books, published by Henson's publishing division with Scholastic, will further the publishing aspirations of the company.”
Henson revived the idea of producing more picture-book specials in his original pitch for The Jim Henson Hour—wanting to produce monthly episodes with stories in the vein of Emmet Otter's Jug-Band Christmas, The Christmas Toy and The Tale of the Bunny Picnic.
Pipe Dream is a lesser known Rodgers and Hammerstein musical which ran for 246 performances on Broadway in 1955, based on the novel Sweet Thursday by John Steinbeck. A film version of the musical was proposed starring the Muppets. Humans would play Doc and Suzy; Muppets would play the other roles—with Miss Piggy as Fauna, Kermit as Mac and Fozzie as Hazel.
Read My Lips
"Read My Lips" was a pilot script for a comedy series co-written by Muppet performer Richard Hunt in the late 1980s. The show was about puppets who come to life after they've been put away for the night.
A 1993 Wall Street Journal article mentioned plans for a new Muppet project:
Sesame Street Discovers America
Super Sesame Heroes
An animated Sesame Street spin-off starring Super Grover and a team of other Sesame Street monsters (Cookie Monster, Rosita, Elmo and Zoe), meant to teach conflict resolution. A proof-of-concept pitch was made for the international markets, but the series never came to full fruition.
Tales of Muppetland installments
Following the airing of The Muppet Musicians of Bremen in 1972, Jim Henson began brainstorming ideas for future installments. Ideas included adaptations of Aladdin, Jack the Giant Killer, The 13 Clocks and The Velveteen Rabbit.
Untitled archaeological adventure
While brainstorming ideas for a fourth Muppet film, Jim Henson and Jerry Juhl seriously considered "taking them [the Muppets] on an archaeological adventure to discover their roots" before settling on the idea of The Cheapest Muppet Movie Ever Made!.
Untitled Miss Piggy pregnancy movie
While brainstorming ideas for a fourth Muppet film to follow The Muppets Take Manhattan, Jim Henson and Jerry Juhl considered a proposal for a film where Miss Piggy might be pregnant. Henson dismissed the concept, calling it a little too "specific and explicit."
Untitled superhero project
- Jim Henson: The Biography by Brian Jay Jones (page 128)
- Jim Henson: The Biography by Brian Jay Jones (page 413)
- "Muppet Might-Have-Beens" by Danny Horn. MuppetZine #13, Summer 1995
- Jim's Red Book - 7/-/1983 – Taping for Please Don’t Eat the Pictures at the Met. For SS special – talk to Karl Katz during that – begin Muppetamia
- Jim Henson: The Biography by Brian Jay Jones, page 214.
- Muppet Central news September 17, 2005
- Schnol, Janet. "Disney to Launch Book Division with Startups and an Acquisition", Publisher's Weekly. July 27, 1990.
- ToughPigs.com - My Day On a Muppet Movie Set
- Starlog Issue #265, August 1999.
- Muppet Central news June 5, 1998
- The MuppetCast episode #89 - December 21, 2008
- Live Design Online
- Loevy, Diana. "Inside the House That Henson Built", Channels. March, 1988.
- Mandelbaum, Ken. Not Since Carrie: 40 years of Broadway Musical Flops. New York: St. Martin's Griffin, 1992. p. 99.
- Mordden, Ethan. Rodgers & Hammerstein. New York: Harry N. Abrams, Inc., 1992. 
- Jim Henson: The Biography by Brian Jay Jones (page 402)
- Cox, Meg. "Kermit's Keepers: Jim Henson Is Gone, But Muppets Thrive Under His Children", The Wall Street Journal. August 9, 1993.
- Smithsonian Staff -Rayna Green
- National Endowment for the Humanities, June 22, 1992
- Sesame Street: A Celebration - 40 Years of Life on the Street, page 247
- Jim Henson: The Biography by Brian Jay Jones (page 188)
- Jim Henson: The Biography by Brian Jay Jones (page 407)
- Jim Henson: The Biography by Brian Jay Jones (page 407)
- Personal communication, Scott Hanson and Craig Shemin