Duology

Duology is term sometimes used to describe a two-volume film or book cycle, especially in the science-fiction or fantasy genre.

It is possible that the word itself was coined first by Dennis L. McKiernan in 1984-1985 when his editor, Patrick LoBrutto, at Doubleday asked Dennis what to call his two-volume work "The Silver Call," which was just at the beginning of the production stage. At the time, trilogies were very popular, and so Dennis suggested "duology" might be taken as a word similar to trilogy. Apparently neither Patrick nor Dennis had ever seen or heard the term before that time, but Patrick accepted it .


Examples
Literature
* The Silver Call (Trek to Kraggen-Cor (1986) / The Brega Path (1986))
* Lirael and Abhorsen by Garth Nix (although these books are often cited as being part of a trilogy with the standalone "Sabriel" written in the same universe.
* The Stars Are Cold Toys and Seekers of the Sky by Sergey Lukyanenko, which are Russian science-fiction books.
* Ilium/Olympus by Dan Simmons

Cinema
* The biopics Guerrilla and The Argentine starring Benicio del Toro as Che Guevara
* The films Flags of Our Fathers and Letters from Iwo Jima directed by Clint Eastwood
* The Icelandic films Börn and Foreldrar by Ragnar Bragason
 
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