Now that the Ghosts franchise is doubling in size, it is clearer than ever that the CBS sitcom could pull off a wild crossover event. The ghosts of CBSs Ghosts are the real heroes of the show, as was the case in its British inspiration of the same name. Both comedy shows get a lot of laughs from their human heroes, but it is the varied range of mismatched ghosts that anchors the shows action and comedy. Unfortunately, it has historically been tough to see how the ghosts from both versions of the show could ever meet onscreen.

https://screenrant.com/ghosts-australia-germany-spinoff-crossover-problem-solve/