Firefly was Joss's venture into outter space. It was like... Star Trek, if it took place in the wild west. The show itself was alright but not great by any standards. Since the show got cancled, Joss gave two of it's stars the title of "the big bad" on season 7 of Buffy and season 4 of Angel. Although... Caleb on Buffy was only semi-big bad because he was working for the original evil and the hell mouth and shit.