The RKO Radio Pictures, Incorporated series (1930-1974) contains material primarily pertaining to development of RKO films during Hughes' ownership of the company. This series primarily features The Conqueror (1956) and Jet Pilot (1957), but also includes material for other films such as His Kind of Woman (1951), and Son of Sinbad (1955). Records include film set and publicity photographs, film advertising and news articles, screenplays, ledgers, and music scores. Corporate materials contain newspaper clippings, copyright documents, administrative correspondence, actor contracts and agreements, and stock information. Also included are scripts, screenplays, and manuscripts collected to draft potential film adaptations. Ledgers contain theatrical screening reports and corporate budgets. Other materials include reports pertaining to the Cold War and film industry blacklisting.

The Conqueror sub-series (1950-1956) contains materials related to the development, production, and post-production of the RKO Radio Pictures film The Conqueror (1956). The records consist of correspondence, story development records including screenplay and multiple script revisions, technical notes, and advertising. The bulk of the materials are original orchestral scores with some handwritten annotations. These scores were written by Victor Young and arranged by Sidney and Murray Cutner.