Spike in Firefly Season 6
From a Joss Whedon interview conducted back in 2005
Could Serenity take place in the same universe as Buffy but the monsters were taken care of long ago?
I think you could make an argument for it, but I wouldn’t. The only thing we ever thought of doing is having a drunken and very miserable Spike at a bar just sitting there going, ‘Nothing changes. Trust me, nothing changes.’ That would’ve been in our decadent era. That would have been like season six. But no, I have to think about them as totally separate because they have different sensibilities and they have different sets of rules. It’s very important that Serenity be grounded. I had to go into outer space to come back down to earth but Buffy was a fantasy, a metaphor for rites of passage of our lives and Serenity is something else.
