Question: How many episodes of the Spanish animated television series, on which "The Gnomes' Great Adventure" was based, were produced?

Context paragraphs:
Barney's Great Adventure: Barney's Great Adventure (also known by its promotional title Barney's Great Adventure: The Movie) is a 1998 American musical adventure film based on the children's television series "Barney & Friends", featuring the character Barney the Dinosaur.  The film was written by Stephen White, directed by Steve Gomer, produced by Sheryl Leach and Lyrick Studios and released by PolyGram Filmed Entertainment on March 27, 1998 in the United States and Canada at the height of Barney's popularity.

Nico (TV series): Nico (known as "Nicholas" in most non-Spanish-speaking countries) was a 2001 Spanish animated television series produced by BRB Internacional and the National Organization of the Spanish Blind about the title character, Nico a boy that is blind.  Blind people in the cartoon are usually referred to by the more politically correct term "visually impaired" (invidente) regardless of how severe, or otherwise, their blindness is.

Maria Maggenti: Maria Maggenti (born c. 1962) is an American film director and screenwriter for film and television, who has traditionally created independent films.  She was the script editor for the American television series, "Without a Trace" (2003) and has written many episodes for the show as well, but is perhaps best known for her feature film, "The Incredibly True Adventure of Two Girls in Love" (1995).  Her film "Puccini for Beginners" was in competition at the Sundance Film Festival in January 2006.  She was also an activist with ACT UP for many years.

Fantaghirò (TV series): Fantaghirò is a 1999 Spanish animated television series based on the Italian fantasy film series "Fantaghirò".  It was created by BRB Internacional with animation by Colorland Animation Production, written by Francesca Melandri, Giovanni Romoli and Lamberto Bava, produced by Mediaset, Telecinco and Grupo Planeta, with music by Mark Bradley and Terry Wilson.  A 75-minute animated film "Fantaghirò: Quest for the Kuorum" edited together using footage from the series was released in 2000.

Sendokai Champions: Sendokai Champions (known as Desafío Champions Sendokai in Spain) is a Spanish animated television series developed by Kotoc Produccions for Televisión Española.  The series is created by Freddy Córdoba and Roger Córdoba.

The World of David the Gnome: The World of David the Gnome, originally titled David, el Gnomo (also known as David, the Gnome), is a Spanish animated television series based on the children's book "The Secret Book of Gnomes", by the Dutch author Wil Huygen and illustrator Rien Poortvliet.  The program was originally created in Spain by BRB Internacional (who were also responsible for the "Dogtanian and the Three Muskehounds" franchise and other cartoons such as "Bobobobs" and "Around the World with Willy Fog") titled "David el Gnomo", and retains a sense of the lush illustrations of the original books.  Twenty-six episodes were produced.  There was also a spin-off series entitled "Wisdom of the Gnomes".

A Thousand and One... Americas: A Thousand and One... Americas (Spanish: Las mil y una... Americas ) is a Spanish animated television series produced by BRB Internacional and Televisión Española to celebrate the 5th centenary of Christopher Columbus' voyage to America.

Sherlock Holmes (1954 TV series): Sherlock Holmes was a detective television series aired in syndication in the fall of 1954, based on the Sherlock Holmes stories of Arthur Conan Doyle.  The 39 half-hour mostly original stories were produced by Sheldon Reynolds and filmed in France by Guild Films, starring Ronald Howard (son of Leslie Howard) as Holmes and Howard Marion Crawford as Watson.  Archie Duncan appeared in many episodes as Inspector Lestrade (and in a few as other characters).  Richard Larke, billed as Kenneth Richards, played Sgt. Wilkins in about fifteen episodes.  The series' associate producer, Nicole Milinaire, was one of the first women to attain a senior production role in a television series.

The Gnomes' Great Adventure: The Gnomes' Great Adventure is a 1987 American animated film first released in 1987, directed by Harvey Weinstein and released by Miramax Films in 1987.  The film was Weinstein's second and final directorial attempt since 1987.  The film was based on The World of David the Gnome, it follows the life and adventures of the gnomes as they struggle to outwit enemy trolls.  Although the film is relatively unmemorable today, some well known actors did contribute to the film, including Tom Bosley, Christopher Plummer, Bob Elliott, Ray Goulding and Frank Gorshin.  The English soundtrack to the film was rerecorded in 1995 by the London-based company Village Productions, Ltd with an entirely different voice cast.

Wisdom of the Gnomes: Wisdom of the Gnomes (Spanish: "La llamada de los gnomos" , literally "Call of the gnomes") is an animated series produced by Spanish company BRB Internacional about Gnomes.  It was a spin-off of the series "The World of David the Gnome".  It was based on the books "The Secret Book of Gnomes" by Wil Huygen.

Supporting paragraphs: The Gnomes' Great Adventure The World of David the Gnome
Answer: Twenty-six