The entire town of Sunnydale ends up in the Firefly Universe.

Firefly xover. The Alliance has done some less than wonderful things over the years. This time, though, they meddled with forces that tend to meddle right back.

There’s a stowaway on board Serenity who isn’t exactly what she appears to be. BtVSFirefly xover

The future holds rooms within rooms where madness is life, life is madness, and two become one who is two. This piece is extremely stream of consciousness, so it may not make a great deal of sense. BuffyFirefly xover.