The Big Ten megacorporations are central pieces of Shadowrun's Sixth World setting, and keeping up-to-date on them is important for players and gamemasters alike. New chaos is always threatening to engulf the corps, and the departure of Ares from the UCAS and the death of Spinrad Global head Johnny Spinrad has that chaos rising. Power Plays looks at each of the Big Ten, along with some important AA corps, while also providing plot hooks for gamemasters and character options for players. If you're involved in the Sixth World in any way, you need this book.