B5 was an awesome show and ill miss it but i think that the best part was that it was hard to figure out the plot arc. I mean the shadow wars ended way before the end of the series(where a regular network would have put it) and the story still had a lot of life left in it afterwards... "A Call to Arms" looked like a really predicable lead in to an new series (i mean geez a 5 year mission to find new life forms, blah, blah blah)
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