I think
Homeworld or
Homeworld: Catalcysm would both make excellent television shows, provided you had the right combination of writers, directors, and actors. Even more important, though, would be the music. The
music of the Homeworld games is a
very important part of the experience, and does an excellent job in establishing the mood of the game. Since the Homeworld games have definite endings to them, I'd say a TV series based off of them would last one or two seasons before drawing to a close. Ideally, I'd put the number of episodes at 26 or 32, as there are 16 missions in the game, though the first two or three missions could be condensed into a single episode or two that would set the stage for the rest of the series.