Conquest of the Planet of the Apes (1972): Cast, Plot and Ending Explained

In Conquest of the Planet of the Apes, Caesar is sold into servitude, learns how the system controls apes, organizes a revolt and takes the city, then chooses to spare the human governor he has at his mercy.

Armando is questioned by police and dies in custody, which leaves Caesar alone. He is sold at auction as a servant and ends up in the household of Governor Breck, the man who runs the apes' control system. Breck's aide MacDonald, a sympathetic man, gradually comes to suspect what Caesar really is. Caesar keeps his silence in public, but he sees apes beaten and trained, and he starts to organize them in secret.

Breck's security chief, Kolp, hunts for the talking ape. Caesar is captured and tortured, and then he escapes. From there the film turns into a riot picture. The apes rise up, fight riot police through the streets and take over the city center.

Breck is captured, and Caesar holds him at gunpoint in front of the crowd. He is on the verge of having him executed, but Lisa and MacDonald urge mercy. Caesar declares that the apes have seen the birth of the planet of the apes. The apes lower their weapons, and the revolt ends on a note of hope.

The ending of Conquest of the Planet of the Apes shows Caesar choosing mercy at the exact moment the apes expect revenge.

Here is the sequence. Caesar has Breck at gunpoint, the crowd wants blood, and Lisa and MacDonald argue for restraint. In the released cut, Caesar spares Breck and speaks of a new future for apes, declaring that the apes have seen the birth of the planet of the apes. An earlier version ended with the apes killing Breck, but after a poor preview reaction in Phoenix on June 1, 1972, the studio reworked it. So, the hopeful note is partly a commercial correction.

In my opinion, the reworked ending is the more interesting of the two, though perhaps not for the reason the studio had in mind. A film that has spent most of its 88 minutes showing apes beaten into obedience earns its violence, and an executed Breck would have been a satisfying release. Caesar's refusal is harder, because it turns the revolt into a founding act rather than a payback. The choice also lands because of who is asking for restraint: MacDonald, the aide who slowly worked out what Caesar was, and Lisa, whose voice carries weight with the apes. Mercy arrives from inside the household, not from outside it.

The setup matters too. Armando dies in police custody after Caesar's slip of the tongue, and Caesar is then tortured under Kolp's hunt. By the time he holds the gun, he has lost his guardian and been broken down by the system, so sparing Breck is a deliberate refusal to copy it. Thompson reinforces the point visually: dark, muted clothing for the humans, colorful costumes for the apes, so the uprising looks like color pouring into a gray city.

It could be argued that this is also why the next film exists. Battle for the Planet of the Apes, which Thompson also directed, picks up the start of ape rule and tests whether Caesar's mercy can hold. Compare that with the other films in the saga: Planet of the Apes (1968) ends on a ruined world already ruled by apes, and Conquest explains how that rule began, with the talking son of Cornelius and Zira, the pair who arrive in Escape. The modern run takes a different road, since Rise of the Planet of the Apes gives Caesar a new origin entirely. For more on how the stories line up, see the Planet of the Apes timeline.