Roddy McDowall credited as playing...
Cornelius
- Chairman of the President's Committee of Inquiry: [testing Lewis's assertion that the apes can speak] What is your name?
- Dr. Zira: Zira.
- Chairman of the President's Committee of Inquiry: One might as well be talking to a parrot.
- Dr. Zira: A parrot?
- Chairman of the President's Committee of Inquiry: What did I tell you? Mechanical mimicry. Unique in an ape, vocally, without a doubt, but... does the other one talk?
- Cornelius: Only when she lets me.
- Cornelius: They became alert to the concept of slavery. And, as their numbers grew, to slavery's antidote which, of course, is unity. At first, they began assembling in small groups. They learned the art of corporate and militant action. They learned to refuse. At first, they just grunted their refusal. But then, on an historic day, which is commemorated by my species and fully documented in the sacred scrolls, there came Aldo. He did not grunt. He articulated. He spoke a word which had been spoken to him time without number by humans. He said 'No.'
- Cornelius: By the time the plague was contained, man was without pets. Of course, for man this was intolerable. I mean, he might kill his brother, but he could not kill his dog!
- Chairman of the President's Committee of Inquiry: [referring to Cornelius] Does the other one talk?
- Cornelius: [indicating Zira] Only when she lets me.
- Cornelius: I do know this: One of the reasons for man's original downfall was your peculiar habit of murdering one another. Man destroys man. Apes do not destroy apes.
- Cornelius: If we are caught, we will almost certainly be killed. Please give us the opportunity... to kill ourselves?
- Dr. Lewis Dixon: I shouldn't do this, but I guessed you'd ask.
- [Dr. Dixon hands Cornelius a gun]