“Kingdom of the Planet of the Apes” diverges further from the narrative conclusion of Caesar’s saga, venturing into a future where Caesar is mythologized and societal knowledge has dimmed, leading to a fragmented world of conflicting ape clans.
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How Kingdom of the Planet of the Apes Inches Closer to the Events of the Original Film
https://www.denofgeek.com/movies/kingdom-of-the-planet-of-the-apes-original-1968-movie/
So, it’s a current history documentary.