Peter Cullen's long road as Optimus Prime continues with 'Transformers: Titans Return'

Peter Cullen and the head of the famous character he voices, Optimus Prime. Peter Cullen and the head of the famous character he voices, Optimus Prime. For a generation of 1980s-reared cartoon-loving television viewers, Peter Cullen's voice as Optimus Prime in movies, TV shows, video games and even toys is instantly recognizable. He has continued to voice the character on and off throughout the years, and returned to Optimus earlier this year in Michael Bay's "Transformers: The Last Knight," which made more than $605 million worldwide this summer. In next year's "Bumblebee," the Transformers spin-off film that recently wrapped filming, Cullen's red, silver and blue Optimus Prime figures in the plot focused on the smaller but ever-popular yellow-and-black Autobot.