The final film in the original Apes series is the most hopeful with its message of coexistence.
All tagged Escape from the Planet of the Apes
The King is Dead, Long Live the King: Conquest of the Planet of the Apes (1972)
The fourth film in the original Apes series is the most brutal and the best, according to Marcelo.
Let Man be Dominated by Such as You: Escape From the Planet of the Apes (1971)
In one of the best entries in the Apes series, things go from light-hearted to bleak pretty quick.