12 Angry Men
The casting in this movie is perfect. Every single juror in the film makes this trail much more interesting and the see the points of jurors change whether the boy should be guilty or not guilty makes this film a acclaimed classic that everyone remembers based on all of the twelve jurors in the movie.
The Dark Knight
The casting of this film is pretty remarkable for a Batman film because they are usually not a lot major stars in this movie in most of the Batman movies that were created before Nolan's decided the reboot the franchise. The acting from everyone who was in Batman Begins improved since most of cast members who were in the movie were getting the hang of playing their own roles in the Dark Knight Trilogy, but the acting from Heath Ledger made this film as iconic when it comes to comic book movies and that why this movie is in the ensemble cast for this meme.
Star Wars IV: A New Hope
The castings in the film was pretty unknown back in the 1970's until this movie became a box office hit, but when you think about how famous all of these stars are today, you can easily say that they had a major ensemble cast that they have used throughout the original trilogy, which is pretty remarkable when it comes to how popular Star Wars is. Without George Lucas and the casting people, we probably would have not heard of Star Wars at all.