Planet of the Apes (1968 film) was not written by an American.
The screenplay by Michael Wilson and Rod Serling was loosely based on the 1963 French novel La Planète des Singes by Pierre Boulle.
Michael Wilson -LRB- July 1 , 1914 -- April 9 , 1978 -RRB- was an American screenwriter who was blacklisted by the Hollywood film studios during the era of McCarthyism for being a communist.
Rodman Edward `` Rod '' Serling -LRB- December 25 , 1924 -- June 28 , 1975 -RRB- was an American screenwriter , playwright , television producer , and narrator known for his live television dramas of the 1950s and his science-fiction anthology TV series , The Twilight Zone.
