From the back of the 192-page core rulebook: "Adventure throughout the Star Fleet Universe as a member of an elite Federation Prime Team, poised and ready to deal with any emergency. Prime Directive gives you everything you need to play the true thrill-seekers of the Federation, including: Historical background and rules for creating Prime Teams. Comprehensive background material for the Klingons, Romulans, Tholians, Gorns, Lyrans, Kzintis, WYNs, Hydrans, and more, with sections on their history and weapons! Two ready-to-play Prime scenarios, Web of Darkness and The Kam'srit Riddle, AND the Star Fleet Universe timeline. The Universe is yours to explore in Prime Directive! Suitable for two or more players, ages 12 and older."