Conquest of the Planet of the Apes was written by a Canadian.
Conquest of the Planet of the Apes is a 1972 science fiction film directed by J. Lee Thompson and written by Paul Dehn . Paul Dehn ( 5 November 1912 -- 30 September 1976 ) was an Oscar-winning British screenwriter , best known for Goldfinger , The Spy Who Came in from the Cold , Planet of the Apes sequels and Murder on the Orient Express .