A first in entertainment, Defiance was developed as a MMO FPS video game AND a sci-fi tv show at the same time! I just saw the first episode and was blown away. Rockne S. O'Bannon is one of the creators and he was also the creator of Farscape and seaQuest DSV.
I just loved everything about it. The actors, acting, characters, action, sets, CGI, races, vibe, everything!
Here's a cool video "one hour with Defiance" from IGN showing alpha gameplay on the Xbox 360. You can play the MMO FPS on PC, PS3 or Xbox 360