I *love* Castle! Started watching it because it reminded me of L&C and Law and Order:SVU (another one my favs). I think Nathan Fillion and Stana Katic have a great chemistry together, and the show is just *fun*. It's got the whole murder mystery thing going on, but it definitely has it's lighter moments. The relationship drama is there, too, but hey, a little angst never hurt anyone. It's a great show!

(Interestingly enough, Rat, I liked Beckett better when I first started watching it! I had never seen Nathan in Firefly, so for some reason, it took me a minute to warm to him. Of course, a season later, and I can't imagine anyone else in the role!)

Anyway, Tank, I'd love to see this crossover - usually I'm not big on them, but I think you are a terrific writer and would do a great job with this one. I think you have a really good start!