All Over the Universe: Lois and Clark have to save Buffy from leaving on the Starship Enterpise when it turns up in the past, on a mission to stop Disney from taking over the Star Wars franchise. Daniel Jackson attempts to convince the magical Halliwell sisters to help him vanquish the Cylons, who have hitchhiked to Earth on the Enterprise to escape the wrath of The Doctor.
A LnC/DrWho/Star Wars/Star Trek/BSG/Stargate/Buffy/Charmed/Disney Xover. You'll luv it.
I sort of wrote this one once (actually there's only four fandoms in this one, but since it's a drabble I think that can be excused:
http://archiveofourown.org/works/156251Slight bad language towards the end
