Aldo is first referenced in the third Apes movie, Escape from the Planet of the Apes, when the chimpanzee Cornelius describes him as the first ape to acquire the power of speech—and the first to say "No!" to his human captors. He appears in the next film, Conquest of the Planet of the Apes, as a Chimpanzee whose beating at the hands of human guards is witnessed by Armando and Caesar, the son of Cornelius and Zira, who later leads the ape revolt.