Moment From Planet of the Apes
At the very end, our protagonist returns to his timeline only to find that apes have replaced humans completely.
After a spectacular crash-landing on an uncharted planet, brash astronaut Leo Davidson finds himself trapped in a savage world where talking apes dominate the human race. Desperate to find a way home, Leo must evade the invincible gorilla army led by Ruthless General Thade.
Tags: gorilla, space marine, space suit, revolution, chimp, slavery, space travel, time travel, dystopia, alien planet, ape, human subjugation