User blog comment:Princeofallsalads/Favorite Fanfic/@comment--20101029203804/@comment-3000576-20101029233541

Is this gonna end up like the PTSN situation?

Anyway, crossovers are okay, as long as your not distorting the entire canon. An example would be the Multiverse Time War Saga in SA (starting with the short story, "Another Dimension's Tale..." As for breaking canon, the same rules apply.