The captured astronaut was played by Charleston Heston.
The apes called him Bright Eyes.
Little known is that the original script was written by Rod Serling. But it underwent many rewrites before filming began.
The movie was shot in California, Utah and Arizona. In 2001, Planet of the Apes was selected for preservation in the United States National Film Registry by the Library of Congress as being “culturally, historically, or aesthetically significant”.
Watch the two-minute trailer of the movie: