Cross-Over Fanfiction

You ever wonder what it would be like for your favorite characters to meet each other? Unfortunately, not many people have cross-overs, mostly because of network conflicts or similar problems. After all, it's very unlikely characters from a sci-fi program could interact with ones from a drama. Fortunally, in the fanfic world, we have no such obsticles.
This section is dedicated to those kind of stories. If you're unfamiliar with one side of the cast, don't worry...I'm aiming them to be as easy for newcomers to follow as possible.