I have to say, when I ordered this book along with some sourcebooks from another site, I was amazed at how familiar the setting and new rules system was. Traveller is reprinted for the most part with Career progression and six alien races as alternative packages for PC jollies. Starship combat, the Spiral and Inner Core systems are briefly outlined and even alternative option rules for weapons and propulsion systems are on offer. Want to play Star Trek- Got warp drive tech. Wanna play Star Wars- Got heavy Drives. Wanna play your own home brew space ex game- Traveller core rules have everything bundled that you will need. You can of course add to the collection if you desire with eight other similarly designed books, reproducing the Robot, Scout, Spy, Imperial navy and other careers any Traveller player will remember. Of course almost all of these are covered in the Core rule book but there is so much more to them all if you invest in the set. Traveller will always have a soft spot in my heart because its the first part of my journey into the RPG lifestyle and I thoroughly recommend it.