From the back of the box:
"The Klingon Empire Wants You!
It is ancient Klingon belief - the naked stars remember acts of courage performed under them. Find out why, and find out hundreds of other fascinating facts about the Klingon Empire in this expansion set for STAR TREK: The Role Playing Game!
More than a supplement, this set provides not only complete creation system for Klingon player characters, but complete technological, cultural and physiological background of Klingons and their society. Klingons are among the most fascinating of STAR TREK's 'villains'. Now, they make fascinating player characters as well!
Written by science fiction writer John M. Ford (author of the upcoming STAR TREK novel 'The Final Reflection') and Guy McLimore, Greg Poehlein and David Tepool of Fantasimulations Associates (designers of STAR TREK: The Role Playing Game), this expansion set extends the horizons of STAR TREK and serves as your official guide to the vast Klingon Empire.
Included are a complete rules and background sourcebook, a book of Klingon Empire adventure scenarios and valuable pullouts and forms, and a set of Klingon player character counters and ship counters. Even if you don't play Klingon characters, you'll want this material for your Star Fleet-based campaigning. STAR TREK enthusiasts everywhere will want access to these never-before-revealed secrets of the Klingon Empire!
Strap on your disruptor pistol, and be sure to watch your back! You have been selected for training as an officer in the most powerful military machine in the known galaxy. The life is hard, but the potential rewards are limitless. All you need is courage, a bit of ruthlessness, and this expansion set (plus STAR TREK: The Role Playing Game)."