In 1962 Baltimore, a plucky, plus-sized teenager dreams of dancing on "The Corny Collins Show," a local TV dance program. Despite facing mockery and discrimination for her weight, she auditions for the show with the support of her friend, aiming to become a regular dancer. Her infectious energy and bold moves impress the show's teen heartthrob, catching the eye of the program's racist producers who reluctantly let her join due to her popularity. Her presence on the show sparks a transformation, making her an overnight sensation and role model for embracing one's uniqueness.

As the teenager enjoys her newfound fame, she becomes increasingly aware of the racial segregation that permeates the show and society at large. Inspired by a friendship with an African American classmate and the realization of the injustices faced by the black community, she decides to use her influence for change. With the help of a dynamic record shop owner, she sets out to integrate the dance show, challenging the racial prejudices of the time. Her journey is met with resistance from the show's producers and her peers, leading to a climactic effort to bring equality to the airwaves, proving that determination and courage can inspire change.