And then I read it, and realized that, no, it isn't impossible, and I was forced once again to reflect on the fact that Highlander seems to be a fandom that is just very open to crossovers. I know that's partly because, hey, you've got 5,000 years of mostly unfilled Methos backstory, and who is to say he didn't pick up a young Christopher Keller in a gay bar? He could have! He could also have spent fifteen years traveling around with Doctor Who. I mean, it's not like he'd necessarily bring either of those things up in conversation. But also, just, the Highlander universe seems to be unusually smooshy - it is totally willing to cozy up to, maybe even move in with, other canons, as I'm reminded every time the HL newsletter comes out and most of the new stories are crossovers.
Naturally, I got to wondering: what other fandoms are particularly crossover-friendly? And that led, inevitably, to thoughts of those fandoms that are much, much harder to work into crossovers. Which led to thoughts of AUs, which in turn took me to a terrifying meta place, and Best Beloved had to come talk me down. "How about a poll?" she said. "Polls are fun! And, also, you can probably finish one before you fall asleep." (Whereas with actual meta - at the rate I'm currently finishing stuff, I'd have it ready for posting in, um, 2012 or thereabouts, assuming no delays for rain.)
So perhaps you would like to write my meta for me? I offer ticky boxes as incentive!
Which fandoms are especially amenable to crossovers?
TFV, you totally failed to include the BEST FANDOM EVER for crossovers, and it is:
Which fandoms are especially crossover-resistant?
There is a fandom so resistant to crossovers that 25% of writers who attempt it do not survive, and it is:
Do fandoms that are good for crossovers tend to be good for AUs (and ones bad for crossovers tend to be bad for AUs)?
The head-splittingest crossover imaginable (two fandoms only!) is:
My secret dream crossover of insanity (two fandoms only!) is: