I could probably come up with something for you in the next few weeks. I could write Babylon 5, Crusade, Doctor Who (any), Firefly, Futurama, Hitchhiker's Guide to the Galaxy, Sarah Jane Adventures, Stargate Atlantis, Stargate SG-1, Star Trek (any of the series, though I'm best with DS9 and ENT), Star Wars (prequels or original trilogy), and Torchwood.

I could also (probably) pull off Andromeda, Battlestar Galactica, and/or Farscape, though that offer's only valid if you're extremely desperate since it would require me doing some marathoning to get reacquainted with canon.