Planet of Darkness is an adventure designed for the ALTERNITY science fiction roleplaying game. It takes place in the Oberon star system, described in the STAR*DRIVE campaign setting. You can play it as a stand-alone adventure or use it as the foundation for a trade-based, Progress Level 7 campaign. In these pages, you'll find general information about the planet Lison and how to managa a campaign on this unusual world. The heroes become entangled in the machinations of two stellar nations determined to take more than their share of Lison's most precious resource: rhodium. * Act I: Rhodium Run introduces heroes to life and trade on Lison. Through their dealings, the heroes uncover a sinister plot involving a cykotek oxygen runner and a nefarious black marketeer. * Act II: The Omega Agenda challenges heroes to investigate the disappearance of oxygen runners on the planet's surface and expose an insidious enemy threatening the rhodium trade. * Act III: Eclipse puts heroes against a stellar nation ready to take the entire world hostage. With the aid of some alien artifacts, the heroes must breach the defenses of a dreadnought to end the blockade.