Prince Charon said:
There's a very short one called 'Daddy Issues', but I can't recall the author.? It probably would be good, if it were ever continued.
Emperor Xander also included James Bond and Highlander in the list of crossovers and I'm sure there are still more included as Xander, Willow, and Buffy sent out a worldwide recruitment offer to attract soldiers to form a force to defend the Hellmouth with.
Armageddon has potentionally even more series crossed in it as well as a somewhat *slow* pace. The author, thonomike, reminds me of a Perfect Lionheart without the character bashing or bashing in general involved in the story. His stories have potential, but mike tries to create these vast epics that end up lacking focus.