Transformers: Age of Extinction's only lead role is played by an English actor.
Mark Robert Michael Wahlberg ( born June 5 , 1971 ) is an American actor , producer , businessman , former model , and rapper . Peter Claver Cullen ( born July 28 , 1941 ) is a Canadian voice actor . Transformers: Age of Extinction . It stars Mark Wahlberg , with Peter Cullen reprising his role as the voice of Optimus Prime , as the lead roles .