The first glimpse of the film sees Sweeney — known for her long blonde hair — in the ring as the boxer. Her transformation finds her with Martin's classic dark curly locks and toned arms. Sweeney sported a white tank, long shorts with tassels, a mouthguard and red boxing gloves in the photo.

See a new photo of "Euphoria" star Sydney Sweeney looking unrecognizable as boxer Christy Martin in an upcoming biopic.

Sydney Sweeney will transform into the boxer Christy Martin in the forthcoming film, Christy. Here’s what to know about the biopic.