I have started my own series watching the beginning of Pancrase intertwining with the beginnings of the UFC. You can see my thoughts and watch all the fights of the first Pancrase event here.
Not many know this, but Pancrase had hosted 4 "MMA" events before the UFC even had their first. Pancrase was host of some of the best fighters in the world at the time. This was 1993.
via Dave Meltzer:
Often times the question of legitimacy and 'worked' matches arises.