Unclassifiable gives a voice to the often-forgotten athletes of the Paralympic Games: athletes with Down syndrome. While they frequently take the podium at international competitions for athletes with intellectual disabilities, Cléo, Marie, Jason, Jean, and many other "T21" athletes are excluded from the most prestigious sporting event of all—due to the absence of a category specifically for them. Far from the stereotype of the always-cheerful person with Down syndrome, this film delves into the intimate lives of these elite athletes, revealing their daily experiences filled with both joy and hardship, rivalry and camaraderie. It offers an immersive journey into the world of these determined athletes, striving to earn their rightful place in society and in the greater narrative of sport.