Cross Over Search

Hi, all!  Looking for Spander (or Spike- or Xander-centric) cross-overs:

Heroes - focusing on Peter and/or Claude.

Dr. Who/Torchwood - focusing on Ninth Doctor and/or Capt. Jack.

If there are comms out there for these, would love a nudge in their direction. If not, maybe this will prompt some plot bunnies out there? Thanks for your help, guys!