Board Thread:General Discussions/@comment-26395315-20150620063554/@comment-831485-20150620181242

More to the point, Toho is quite protective of the Godzilla brand name. And as such, they have stuck only to their stable of monsters, and denying two high profile crossovers in recent years - those being "Godzilla vs Gamera" (2002, Unmade), and IDW Publishing's rejected plans for "Godzilla vs Cthulhu".

Plus, Japan (and Hollywood to a similar extent) is infamous for not being crossover friendly within films; a trend that has only recently started to weaken...But than again, from what little I've seen...Not by much...NOT at all by much.

With that said, it's highly unlikely Gamera and Ultraman will meet Godzilla officially, if at all. And needless to say, this is for certain with Legendary Godzilla.