This category is for pages that discuss the idea of a crossover between two (or more) factions of the fandom. The Big Four fandom, at its core, is the crossover between How to Train Your Dragon (2010), Tangled (2010), Brave (2012) and Rise of the Guardians (2012). Any combination between the four of these movies or any movie with the Secondary Films can be considered a crossover. Any concept that adds Secondary Films to the idea of the Big Four is considered an Extended Universe.
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