The Role of Genre
Action-driven stories tend to spend more time on plot, although subplot is never ignored. Even frenetically paced films like Mission Impossible: The Ghost Protocol contain scenes which explore material centered on emotional content: Agent William Brandt (Jeremy Renner), for example, is wracked with guilt over having failed to protect Ethan Hunt’s (Tom Cruise) wife from being killed in Budapest. This frames many of his actions and his refusal to remain with the team at the film’s conclusion. We later learn that Hunt’s wife is very much alive and that Hunt has known this all along but has kept it secret in order to protect her. This sort of inner layering forms part of the story’s subplot.
Art-cinema inflected films, by contrast, tend to emphasize subplot over plot. In The Piano, for example, the plot, involves Ada’s (Holly Hunter) attempt to get back her piano and thus regain her “voice” and self-expression. The new owner of the piano, George Baines (Harvey Keitel), who is obsessed with Ada, promises to returns the instrument to her in exchange for piano lessons and sex. This thread of lust, obsession, and Ada’s own awakening sexual passion, overshadows the plot, primarily because the action is diminutive in comparison to the spectacle found in Action/Adventure films. By contrast, it is the subplot that contains the large and tempestuous emotions that drive the story forward.
Retaining Plot Prominence
In some genres, such as the conventional Love Story, plot and subplot may even occasionally appear to merge, becoming difficult to pry apart. Here, the “love” thread, which typically provides part of the protagonist’s inner motivation/subplot in the Action/Adventure genres, now becomes the outer goal (plot), itself. This genre typically centers around the attempt of lovers to get/stay together despite mounting obstacles. Strengthening the outer obstacles may prevent the subplot from usurping the role of the plot.
The normal function of the subplot(s) is to support, motivate, and highlight the inner concerns of the plot by exploring the relationships and emotions of the protagonist and other characters through one or several story strands. Occasionally, and depending on genre, subplots appear to usurp the plot.
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