"Andy Serkis is the undisputed master of the newest kind of acting called 'performance capture', and it is time that Serkis gets credit for the innovative artist that he is," Franco wrote for Deadline
Serkis spoke to Movieline about the actor's open letter, saying he was "thrilled" to read it.
"I thought it was extraordinarily bold and honest, and quite frankly I was thrilled that James had written it," Serkis said. "It just goes to show that an actor who is in pursuit of creating drama isn't prejudiced against live-action or performance capture or any method of performing."
He continued: "[Franco] is one of the first actors who have been bold enough to really state, and in such a humble way, that the weight of the movie lies in Caesar's hands. I thought it was incredibly articulate."