Aspiring film director Bobby Bowfinger (Steve Martin) has a script that he thinks will make him a success. It's a sci-fi movie written by his accountant. The title is "Chubby Rain", and if Bobby can get major star Kit Ramsey (Eddie Murphy) for his movie, then producer Jerry Renfro (Robert Downey Jr.) will produce the movie. Unfortunately, Bobby doesn't really have that much money, so he and his cast and crew find creative ways to get Kit into the movie. Things get crazier when Kit escapes and they bring in his twin brother Jiff to finish the movie.