As a huge fan, and player, of the FASA ST-TRPG I have long been bemused as to why it is an deal match for TOS (and the TOS movies to a lesser extent) but not TNG or any other Trek after. And that got me thinking just what makes TOS so unique both on my TV and on my gaming table. My list is as follows but I would love to read yours (or opinion to the contrary!). Improved humans -not superior ones. Better than we are today, but still with plenty of flaws. Creates drama, is more realistic and helps the audience to identify with them as real people. Following on from that is the oft mentioned triumvirate of Kirk Spock and McCoy. Everymans hero flanked by logical reason on one side and emotional humanism on the other. The "swashbuckling" combat style, whether diving behind dusty ruins phaser duels or "cheesy" punches and kicks. Seat of the pants encounters with monsters and mystery. The crew always feel like they are well beyond their comfort zone, on their own and facing the great unknown. And yet they somehow find a way to survive and suceed. Ship duels at warp speeds at ranges of several thousand miles. Seems more realistic and exciting than the mostly stationary, face to face "battles" of TNG. This is why TOS is unique to me.