While he slept, Heston and the other apes were exposed to ALZ-113 by Caesar. Heston gained new intelligence from inhaling the gas. He was one of the first chimpanzees to be examined by Caesar who saw that he was now an evolved ape. Heston would join the other apes, as Caesar prepared to lead them to freedom.
- Heston is named after the late actor Charlton Heston.