In 1987, the Robotech animated series was adapted into novel form by authors James Luceno and Brian Daley and published by Del Rey Books. Having previously collaborated on the animated series Galaxy Rangers, the pair released the Robotech novels under the unified pseudonym of "Jack McKinney". Using fictitious epigraphs in the style of Dune, McKinney's novels escaped the limitations inherent in the dubbed cartoon and fleshed out its chronology in greater detail; most significantly, by adapting the storyline of the aborted sequel project, "The Sentinels". The entire series lasted for twenty-one books, the first fifteen of which were later collected into five three-book omnibus compilations in the early 1990s. The original twelve novels were written to a tight twelve-month deadline, so that the books could be released one per month. Under this deadline, Daley and Luceno divided the Robotech timeline into twelve segments and worked on different segments simultaneously (i.e. Daley wrote Book 1 while Luceno wrote Book 2), then traded completed manuscripts for revision and style adjustments. As part of the research project, they watched the TV series many times, and consulted heavily with Carl Macek. The first two omnibus collections, comprising the entirety of the "Macross Saga", were reissued in 2003 to tie in with the release of the Robotech: Battlecry video game. Then, in 2007, the next two omnibus collections, covering the remainder of the television series, were re-released as tie-ins to the animated movie, Robotech: The Shadow Chronicles. However, a revision of the Robotech timeline made by Harmony Gold alongside the release of the movie caused some continuity clashes with the McKinney novels, which were relegated to a "secondary" position in Robotech canon. To work around this, the Southern Cross and Invid Invasion collections contain new appendices written by Robotech fan Jonathan L. Switzer correcting any newborn mistakes. Divergences The major divergences from the Robotech television series include: Additional properties are attributed to Protoculture. More than a component of a power source and a hallucinogenic foodstuff for genetic engineering, it is later discovered to also be a mystical force akin to the Force in Star Wars, that, through its "Shapings," manipulated the destiny of the universe, and provides the basis for a link between mind and mecha the use of Robotechnology (a product of technology powered by protoculture matrix energy) enables. Stating that Robotech'''s mecha are partially controlled by the pilot's mental imaging via a "thinking