Ensemble casts in film were introduced as early as September 1916, with D. W. Griffith's silent epic film Intolerance, featuring four separate though parallel plots. The film follows the lives of several characters over hundreds of years, across different cultures and time periods. The unification of different plot lines and character arcs is a key characteristic of ensemble casting in film; whether it's a location, event, or an overarching theme that ties the film and characters together.
Films that feature ensembles tend to emphasize the interconnectivity of the characters, even when the characters are strangers to one another. The interconnectivity is often shown to the audience through examples of the "six degrees of separation" theory, and allows them to navigate through plot lines using cognitive mapping. Examples of this method, where the six degrees of separation is evident in films with an ensemble cast, are in productions such as Babel, Love, Actually and Crash, which all have strong underlying themes interwoven within the plots that unify each film.
Ensemble casts are notably prevalent in the superhero genre, where characters established in their own individual films will later appear together in large crossover films. The Avengers and Justice League are notable examples of this. In The Avengers, there is no need for a single central protagonist in the feature as each character shares equal importance in the narrative, successfully balancing the ensemble cast. Referential acting is a key factor in executing this balance, as ensemble cast members "play off each other rather than off reality".
Another notable example is the action film series The Expendables which collectively features the most flamboyant names of Hollywood action movies production.
Ensemble casting also became more popular in television series because it allows flexibility for writers to focus on different characters in different episodes. In addition, the departure of players is less disruptive to the premise than it would be if the star of a production with a regularly structured cast were to leave the series. The television series Friends is an archetypal example of an ensemble cast occurring in an American sitcom. Ensemble casts of 20 or more actors are common in soap operas, a genre that relies heavily on the character development of the ensemble. The genre also requires continuous expansion of the cast as the series progresses, with soap operas such as Days of Our Lives and The Bold and the Beautiful staying on air for decades. Science-fiction mystery drama series Lost also features an ensemble cast.
An example of a success for television in ensemble casting is the Emmy Award-winning HBO series Game of Thrones. The epic fantasy series features one of the largest ensemble casts on the small screen. The series is notorious for major character deaths, resulting in constant changes within the ensemble.
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