Mastocal was the ninth planet in the Sigma Kinna star system in the Klingon Empire in the Alpha or the Beta Quadrant. It was the only class M planet in its system, and it had two moons. It was the location of a major Klingon military base near the Klingon Neutral Zone (FASA RPG modules: The Klingons: Game Operations Manual, The Orions: Book of Common Knowledge). Mastocal had a technological/sociopolitical index of 999794-75 and a planetary trade profile of ECEDDDE/B(B).