Planet of the Apes
Before Charlton Heston went crazy and became better known for his politics than his acting, there were movies like the wonderful Planet of the Apes. An astronaut accidentally finds himself in the future, where apes have risen up and taken over, basically treating the humans the same way they were being treated before. The series went on for a while but the first is absolutely the best, and should be seen. It has a great cast and some really incredible makeup work for its era.