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.