Actor Nathan Fillion was invited to the Bungie studios to play Halo 3: ODST. If you do not know who he is, he is the voice of Buck in ODST. On his first visit, he played ODST for 6 hours, then came back the next day to play some more. Buck in Halo 3: ODST is the squad leader, and the person you will be playing with. Lastly, Fillion was let in on some early secrets to Halo Reach.