Justice Gamma was a prison planet, and the fifth planet in the Justicia system. It orbited two hundred million miles from the system's suns. According to Callis Fel-Fotch Slitheen, there were "fabulous" shops on Justice Gamma. The Blathereen planned to use this planet, and its incarcerated inhabitants, to perform heavy labour.
Justice Gamma had a Middle Eastern jail colony where human prisoners were kept. The prisoners had a wide variety of experiments performed on them, and according to Dennel they were often “drugged up". At some point before 2501, a large number of Gamma's prisoners were relocated to Justice Beta. (PROSE: The Monsters Inside)