"Grindhouse is a 2007 film. In North America, the film is presented as a double feature of two full-length segments, one being a zombie film, Planet Terror, written and directed by Robert Rodriguez, and the other being an action film, Death Proof, written and directed by Quentin Tarantino, with faux trailers advertising fictional films preceding each segment. In much of the rest of the world, the film will be split in two and each feature will be released separately."
So what's the point of joining them up at the cinema if they're different films?
Do they follow the same plot, just with a different theme?