“- Professor Porter: Looks like a man but walks like an ape. He could be the missing link!
- Clayton: Or our link to the gorillas.”
Nigel Hawthorne - Professor Porter
Brian Blessed - Clayton

“Even in most primitive man, the need to create was part of his nature. This need, this talent clearly separated early man from animals, who would never know this gift.”
Orson Welles - Narrator (voice)

“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!”
Roddy McDowall - 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.”
Roddy McDowall - Cornelius

“- Professor: Would someone please like to tell us of a characteristic which separates humans from the rest of the animal kingdom?
- Lampwick: Cages.”
John Sessions - Professor
Corey Carrier - Lampwick