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'Planet of the Apes' movies
The time-travel angle was a great twist at the end of "Planet of the Apes" -- Taylor was on Earth the whole time! But it got increasingly complicated as the series went on -- wait, so somehow the explosion at the end of "Beneath the Planet of the Apes" pushed the salvaged spaceship back in time to the exact right moment in "Escape from the Planet of the Apes"? And those apes from the future were the progenitors of their own ancestors? It's enough to melt your brain.