Superheroes, aliens and franchise retreads are fine for summer. In the fall, we want our sci-fi to seriously blow our minds. That's why "Looper" (pictured) is one of the most anticipated movies of the fall. Joseph Gordon Levitt! Bruce Willis! Rian Johnson! A time-traveling plot line that's melting brains as we speak!
And if that's not enough, there's "Cloud Atlas" -- not strictly sci-fi, but it swoops through characters and time enough to leave you breathless, and has a post-apocalyptic storyline that even the most hardcore geeks will appreciate.