The novel Planet of the Apes is a real trip. I read it last year and wrote a review. It has a weird framing device with its own twist. The whole tale of the monkey planet visited by humans is found in a bottle floating through space. Ulysse, the protag (George in the movie) gets Nova pregnant.

It also introduces some interesting ideas about mimicry and conscious originality. Ulysse' presence causes an existential crisis because the apes realize that far from being the originators of thought as they believe, they were in essence copying humans, where they learned our behavior, how to walk, talk, etc. And how there are basically a tiny number of innovators and then copycats who follow along until shepherded by someone else.