Buffy/Ronon. Buffy ends up in the Pegasus Galaxy somehow (magical portal, inter-dimensional wormhole, spell going haywire, whatever as long as it isn't by way of the SGC) with no way back to her own reality/dimension. She meets Ronon, either while he's Running or at some point after he's joined the Atlantis Expedition. How does Buffy's alpha personality mix with or clash with the Atlantis inhabitants, and can she prevent some of the disasters that happened in canon?
Crossover with NCIS LA. Ronon is arrested by Team Callen for whatever reason and they attempt to question/interrogate him. Meanwhile, Sheppard + Jack try and get him out of there. Back at OPS the Meerkats try and find anything on Ronon, Sheppard, etc, but end up getting denied access and then asked to cease and desist. Background Kensi/Deeks and Sheppard/Mitchell or simply gen. But no McShep or revealing the SGC, please.