“We crunched the global box office numbers (courtesy of BoxOfficeMojo.com) for series and franchises that have at least three installments and are still ongoing. (Hence, no “Avatar” or “Lord of the Rings.”) Then we factored in more diffuse criteria, like longevity (how many could you conceivably make?) and merchandisability (does anyone want toys?). And what we came up with was our movie franchise power list, or the 25 Most Powerful Franchises in Hollywood.”