Board Thread:Off-Topic Fun/@comment-27017932-20160323221053/@comment-24674051-20160621165204

For good or for bad, Once is unlike things like the Marvel Universe or the DCVerse, where there are several loosely related production in the works, and crossovers make sense. Once is in it's own universe, so it would be difficult to do too much in the way of a crossover.

Had Wonderland lasted, it would have been a crossover candidate (and bringing some of the characters from there is still a remote possibility). Otherwise, there is nothing avilable that would be a viable option for a crossover. (Just my opinioni mind you).