This is one of the most famous twists of all time. It's so famous, in fact, that they stuck the iconic image right on the cover of the DVD, despite it being the final frame of the movie - because, really, who doesn't know that it was Earth all along by this point? A bitter, shocking ending that proved essential to broadening of the mythology in later films, Planet of the Apes' final reveal takes the premise's fantastical allegory and tacks on an exclamation point (or ten). This isn't one of those stories where the revelation leads to the happy resolution of a character's arc, either; this ending is dark, and extremely final. Franklin J. Schaffner was playing for keeps.