I found both of these shows to be so entertaining to watch, I never understood why they got canceled, especially Odyssey 5.
Odyssey 5 - http://en.wikipedia.org/wiki/Odyssey_5
Space: Above and Beyond - http://en.wikipedia.org/wiki/Space:_Above_and_Beyond
I own Firefly on DVD but to be honest, when I first saw it on tv, I thought it sucked but I did come in part way into the season - for whatever weird reason, the show just rocks when watched without commercials getting in the way, though I find that to be the case with any number of good shows are just better when there are a lack of commercials present interrupting the flow of the story and I don't have to wait what can seem like arbitrary lengths of time for the next episode. I gave it a shot after Serenity, and when I get to watch it all in a row like that, it is a pretty epic show. Though I don't have the first clue how the show would continue with Preacher, Wash and the ship... would that be spoiling it for anyone? I think I will just leave it there. I think with the movie, the show has pretty much run its course and its done - I know I am glad it is done on high note instead of dragged out to be flogged like the latest X-Files movie.