Nina (Portman) is a ballerina in a New York City ballet company whose life,
like all those in her profession, is completely consumed with dance. She
lives with her obsessive former ballerina mother Erica (Hershey) who exerts
a suffocating control over her. When artistic director Thomas Leroy
(Cassel) decides to replace prima ballerina Beth MacIntyre (Ryder) for the
opening production of their new season, Swan Lake, Nina is his first
choice. But Nina has competition: a new dancer, Lily (Kunis), who impresses
Leroy as well. Swan Lake requires a dancer who can play both the White Swan
with innocence and grace, and the Black Swan, who represents guile and
sensuality. Nina fits the White Swan role perfectly but Lily is the
personification of the Black Swan. As the two young dancers expand their
rivalry into a twisted friendship, Nina begins to get more in touch with
her dark side - a recklessness that threatens to destroy her.
Thomas Leroy, the artistic director of a New York City ballet company, is
mounting Swan Lake as the company's next production. Many of the ballerinas
in the company aspire for the lead, which would have previously gone to the
company's former principle dancer Beth Macintyre before her forced
retirement. No one wants the the role more than Nina Sayers, who lives to
dance, so much so that she wants to be exactly like Beth in every aspect.
Nina lives with her overbearing mother, Erica Sayers, a former ballerina
who now lives vicariously through her daughter as she never made it as a
ballerina herself. Nina is a technically proficient and hard working dancer
who can easily capture the essence of the innocent white swan, but Thomas
doesn't believe she has the dark passion required to portray the black
swan. An unexpected move by Nina convinces Thomas that Nina may have what
it takes, and he gives her the lead. Thomas will do anything to get that
passion out of her. Nina feels that her new place in the company is
threatened by Lily, a ballerina newly arrived into the company from San
Francisco. Lily, who is looser in every aspect of her life than Nina,
encompasses the essence of the black swan more so than Nina. But as Nina
believes Lily is to her what she herself was to Beth, Nina, in doing
whatever it takes to be perfect as both the white swan and the black swan,
descends into madness.