In 1986, Palladium Books published a role-playing game based on the "Robotech" series, including several books covering the "Sentinels" portion of the storyline. The original "Robotech" RPG line went out of print as of June 30, 2001, but Harmony Gold and Palladium Books signed an agreement in 2007 to produce a new line of Robotech RPG books, beginning with a book covering and promoting the feature-length film "The Shadow Chronicles". The "" sourcebook first book was released on March 21, 2008, followed by sourcebooks covering the Macross, Masters, and New Generation chapters of Robotech (redrafted to reflect the Harmony Gold canon). Other sourcebooks and supplements are reflected in the Palladium Books production pipeline.