"Yeah.  Lots of excitement.  Now Angel and the Slayer, they fell in love.  Did the nasty, and apparently Sire's curse had a happiness clause.  He gets too happy, soul goes away, and he becomes his old nasty psychopathic self.  Only worse, 'cause his nasty self has been caged a hundred years.  Bugger takes Dru away from me and has some crazy plan to destroy the world.  So I make a deal with the Slayer.  I'll save her people my Sire has kidnapped, and take Dru and leave town.  Leave her only my Sire to deal with, so long as she kills him I'm happy.  Should have ended happy, right?  At least from a homicidal killer's point of view?  But no.  Dru leaves me.  Says I'm not evil enough for her anymore.  So I end up back where the trouble started.  My Sire's got his bloody soul back, but he leaves, so he doesn't risk getting all happy again.  And I end up getting captured by some government goons who put a chip in my head.  I can't kill anymore, can't even swing a punch, without massive shocks of pain in my head.  I end up having to go to the Slayer and convince her to keep me around for information about the government goons.  And later, I find I *can* kill demons.  So I join her side, for the killing.  The fact that it helps the good guys, purely a bonus for her side."