Brief History of Planet of the Apes

Escape from the Planet of the Apes, 1971
The third film in the series tells the story of how the apes Cornelius, Zira and Dr. Milo manage to escape via Taylor's spaceship before the detonation of a nuclear bomb. They travel back in time and arrive on Earth in the year 1973. After a series of interrogations, Zira and Cornelius accidentally reveal the eventual demise of the human race. The President orders Zira and Cornelius to be sterilized and Caesar, their baby, to be killed. Before dying in a shoot-out, the two ape parents switch babies with another ape, ensuring Caesar's survival.

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