Question: Which film has sequels, The Muppet Christmas Carol or Never a Dull Moment?
Context: Sam Eagle is a Muppet character originating from the television show "The Muppet Show", where he was performed by Frank Oz.  Sam has appeared in every Muppet film; as himself in "The Muppet Movie", "The Great Muppet Caper", "The Muppets Take Manhattan", "Muppets from Space", and "The Muppets", as well as the Head Schoolmaster in "The Muppet Christmas Carol," Samuel Arrow in "Muppet Treasure Island" and a CIA agent in "Muppets Most Wanted."  He also appears in the television series, "The Muppets." Rizzo the Rat is a Muppet character, created and performed by Steve Whitmire.  He is a fictional rat who appeared on "The Muppet Show" and numerous films, with a starring role in the 1992 film "The Muppet Christmas Carol". Kalanta Xristougenon (Κάλαντα Χριστουγέννων) is a Greek traditional Christmas carol (kalanta) translated into English simply as "Christmas Carol."  This carol is commonly abbreviated as "Kalanta" or "Kalanda", some other common titles for this Christmas carol are Kalin Iméran and Christos Genate.  This carol is commonly sung around Christmas and accompanied by light percussion instruments such as the Triangle (musical instrument) and Guitar. It's A Very Merry Muppet Christmas Movie is a 2002 NBC television film, directed by Kirk Thatcher and written by Tom Martin and Jim Lewis and stars Whoopi Goldberg, David Arquette, Joan Cusack, the cast of "Scrubs" and The Muppets.  The plot centers on Kermit the Frog who, after losing all hope for saving the Muppet Theatre, is assisted by an angel who shows him a world in which he had never been born.  The film is an homage to Frank Capra's 1946 film, "It's a Wonderful Life", which has a similar plot. This is a list of productions based on The Muppets characters and franchise, including films, television series and specials, and other media.  The franchise's main work is "The Muppet Show", a syndicated television series which ran from 1976 to 1981.  The franchise includes eight feature films; "The Muppet Movie", "The Great Muppet Caper", "The Muppets Take Manhattan", "The Muppet Christmas Carol", "Muppet Treasure Island", "Muppets from Space", "The Muppets", and "Muppets Most Wanted".  The franchise also includes other series such as "Muppets Tonight" and "The Muppets". A Christmas Carol in Prose, Being a Ghost-Story of Christmas, commonly known as A Christmas Carol, is a novella by Charles Dickens, first published in London by Chapman & Hall in 1843; the first edition was illustrated by John Leech.  "A Christmas Carol" tells the story of Ebenezer Scrooge, an old miser who is visited by the ghost of his former business partner Jacob Marley and the Ghosts of Christmas Past, Present and Yet to Come.  After their visits Scrooge is transformed into a kinder, gentler man. The Muppet Christmas Carol is a 1992 American-British musical fantasy comedy-drama film and an adaptation of Charles Dickens's 1843 novel "A Christmas Carol".  It is the fourth in a series of live-action musical films featuring The Muppets, with Michael Caine starring as Ebenezer Scrooge.  Although it is a comedic film with contemporary songs, "The Muppet Christmas Carol" otherwise follows Dickens's original story closely.  The film was produced and directed by Brian Henson for Jim Henson Productions and released by Walt Disney Pictures. William Paul "Bill" Barretta (born June 19, 1964) is an American puppeteer and producer who has been performing with The Muppets since 1991, when he puppeteered the body of Sinclair family patriarch, Earl Sinclair on "Dinosaurs".  He later developed several new characters on "Muppets Tonight", including Pepe the King Prawn, Johnny Fiama, Big Mean Carl and Bobo the Bear.  Along with having his own Muppet characters, Barretta has taken over several of Jim Henson's roles, such as Dr. Teeth, Rowlf the Dog, Mahna Mahna and Swedish Chef, and briefly took over Jerry Nelson's role of Lew Zealand.  His film debut as a principal puppeteer was in 1996's "Muppet Treasure Island" as Clueless Morgan.  In addition, Barretta has produced two of the Muppets' television films, "It's a Very Merry Muppet Christmas Movie" (2002) and "The Muppets' Wizard of Oz" (2005).  Barretta also provides additional voices on "Kim Possible".  His most recent film performance was in Disney's "Muppets Most Wanted", where he also served as a co-producer.  Barretta also served as an executive producer on the ABC series, "The Muppets". Never a Dull Moment is a 1968 American comedy crime film from Walt Disney Productions starring Dick Van Dyke and Edward G. Robinson and directed by Jerry Paris.  The script by AJ Carothers was based on a novel by John Godey.  The supporting cast features Dorothy Provine, Henry Silva, Slim Pickens and Jack Elam. Developed and performed by Dave Goelz, Gonzo made his first appearance in the 1970 special "The Great Santa Claus Switch", as the "Cigar Box Frackle".  Originally a minor figure in "The Muppet Show", he soon evolved into one of the franchise's primary characters.  Gonzo has appeared in every Muppet film, including "The Muppet Christmas Carol", where he portrayed author Charles Dickens and developed a double act with Rizzo the Rat.
Answer: The Muppet Christmas Carol