"Jojo Rabbit" is a World War II satire that follows a lonely German boy (Roman Griffin Davis as JoJo) whose world view is turned upside down when he discovers his single mother (Scarlett Johansson) is hiding a young Jewish girl (Thomasin McKenzie) in their attic. Aided only by his idiotic imaginary friend, Adolf Hitler (Taika Waititi), Jojo must confront his blind nationalism.