umbrella film
n.— «Traditionally blockbuster and sequel films, or as they are called in the industry “umbrella films,” are planned to make the majority of profit for a company. These films are usually released during summer.» —“How much does hype determine Oscar outcomes?” by Tim Tillman in Loyola College Greyhound (Baltimore, Maryland) Feb. 5, 2008. (source: Double-Tongued Dictionary)
Further reading
Quiz Guy John Chaneski was inspired by a version of film in which a filmmaker went to the trouble to take a clip of every word used in the movie The Wizard of Oz, arranging them in alphabetical order, all the way to the Tin Man’s saying zipper...