Answer the following question: Information:  - Peter Nigel Fluck (born April 7, 1941, Cambridge) is a caricaturist and one half of the partnership known as "Luck and Flaw" (with Roger Law), creators of the satirical TV puppet show "Spitting Image".  - Leigh Francis (born 30 April 1973) is an English stand-up comedian, actor, director, producer, writer, and voice artist, best known for creating Channel 4's "Bo' Selecta!" and portraying Keith Lemon in several ITV and ITV2 shows including "Celebrity Juice", "Keith Lemon's LemonAid", "Through the Keyhole" and "The Keith Lemon Sketch Show".  - Spitting Image is a British satirical puppet show, created by Peter Fluck, Roger Law and Martin Lambie-Nairn. The series was produced by 'Spitting Image Productions' for Central Independent Television over 18 series which aired on the ITV network. The series was nominated and won numerous awards during its run including 10 BAFTA Television Awards, including one for editing in 1989 and two Emmy Awards in 1985 and 1986 in the Popular Arts Category.  - Bo' Selecta! was a British adult sketch show written and performed by Leigh Francis, that lampooned popular culture and was known for its often surreal, abstract toilet humour.  - 2DTV is a British satirical animated television show that was broadcast on ITV in the United Kingdom from October 2001 to December 2004. Lasting a total of five series and thirty three episodes, "2DTV" became the successor of the popular television series from the 1980s, "Spitting Image", and the predecessor of ITV satirical animation from 2008, "Headcases".  - Headcases was an ITV satirical animation show based on current affairs . It employed the same satirical style as Spitting Image , 2DTV and Bo ' Selecta ! but using 3D animation created by UK Visual Effects and animation house Red Vision . Red Vision evolved a series of unique production techniques and a sophisticated animation pipeline to deliver the weekly topical elements of the series to hitherto impossible deadlines . The programme 's only series began on 6 April 2008 , with weekly episodes until 11 May 2008 , airing on Sundays at 10 pm . A seventh episode was televised on Friday , 30 May at 10:30 pm , and an eighth at 10 pm on Sunday , 15 June . The show included celebrities , politicians and members of the British Royal Family in their animated form , taking a role in sketches including scenarios from their own topical issues . The show 's name comes from the fact that all the subjects ' caricatured faces are out of scale with the rest of their bodies .  - Toilet humour, or scatological humour, is a type of off-colour humour dealing with defecation, urination, and flatulence, and to a lesser extent vomiting and other body functions. It sees substantial crossover with sexual humour, such as dick jokes.  - Roger Law (born 6 September 1941, Ely) is a caricaturist and one half of "Luck and Flaw" (with Peter Fluck), creators of the satirical TV puppet show "Spitting Image".  - Animation is the process of making the illusion of motion and the illusion of change by means of the rapid display of a sequence of images that minimally differ from each other. The illusionas in motion pictures in generalis thought to rely on the phi phenomenon. Animators are artists who specialize in the creation of animation. Animation can be recorded with either analogue media, a flip book, motion picture film, video tape, digital media, including formats with animated GIF, Flash animation, and digital video. To display animation, a digital camera, computer, or projector are used along with new technologies that are produced.  - Television or TV is a telecommunication medium used for transmitting moving images in monochrome (black-and-white), or in color, and in two or three dimensions and sound. It can refer to a television set, a television program ("TV show"), or the medium of television transmission. Television is a mass medium, for entertainment, education, news, and advertising.    What is the relationship between 'headcases' and 'television series'?
Answer:
instance of