Battle for the Planet of the Apes (1973)

The final picture in the superb five-part Planet Of The Apes series, Battle centres on a war that will decide who will finally dominate the planet.

The chimpanzee Caesar is a benevolent King presiding over apes and humans alike. But turmoil within the ape power structure leads to conflict and violence between the apes (predominantly the gorillas) and the humans (especially the 'mutants' dwelling in what remains of the city).

The war ends with the apes firmly in control and vowing to live in peace - in a word, the world exactly as Charlton Heston found it when he crash-landed there in the original movie. 

The cycle is complete, ironically so because it is Heston's visit that sets in motion the set of circumstances that drives the three chimpanzee's to escape back to California in 1973 where their son is born. 

Had their son not been born out of his own time, he would never have led the revolt that eventually ended in the earth's simian domination.