Peter Cullen, best known as the voice of Optimus Prime, died peacefully at his Los Angeles home on August 26, 2026, surrounded by his family. He was 85, although no cause of death has been announced. Across his six-decade career, Cullen also voiced Eeyore and KARR from Knight Rider, while contributing creature sounds to Predator.
A Peter Cullen Tribute: The Man Who Made Optimus Prime a Hero
Peter Cullen first voiced Optimus Prime in the original Transformers animated series in 1984. He based the character’s compassionate leadership and quiet strength on his older brother, Larry Cullen, a decorated U.S. Marine and Vietnam War veteran.
Cullen’s heartfelt performance made Optimus Prime more than a cartoon character, turning him into a trusted hero and making phrases such as “Autobots, roll out!” unforgettable. He continued voicing the character across animated series, video games and films, including the live-action Transformers movies from 2007’s Transformers and continued through titles including Revenge of the Fallen, Dark of the Moon, Age of Extinction, The Last Knight, Bumblebee and Rise of the Beasts.
How Old Was Peter Cullen When He Started Voicing Optimus Prime?
Peter Cullen was 43 years old when the original Transformers animated series premiered in 1984. Born on July 28, 1941, he was already an experienced performer by the time he stepped into the recording booth and created the voice that would define his career.
Peter Cullen’s Most Famous Voices
Although Optimus Prime remains his defining role, Cullen brought many memorable animated and cinematic characters to life:
- Optimus Prime in the Transformers television shows, movies and video games
- Eeyore in The New Adventures of Winnie the Pooh and other Disney projects
- KARR, the dangerous robotic vehicle from Knight Rider
- Monterey Jack in Chip ’n Dale: Rescue Rangers
- King Kong in the 1976 King Kong movie
- The Predator, providing the alien creature’s distinctive clicking sounds in the 1987 film
- Various characters in animated favorites such as The Smurfs and G.I. Joe
Peter Cullen Movies and TV Shows to Remember
Fans looking back on Peter Cullen’s career can revisit some of his most popular projects:
- The Transformers animated series
- The Transformers: The Movie
- Transformers: Prime
- The live-action Transformers film series
- Bumblebee
- Transformers: Rise of the Beasts
- The New Adventures of Winnie the Pooh
- The Tigger Movie
- Piglet’s Big Movie
- Chip ’n Dale: Rescue Rangers
- Knight Rider
- King Kong
- Predator
His work earned him a Daytime Emmy nomination for Transformers: Prime and a Lifetime Achievement Award at the 2023 Children’s & Family Emmy Awards.
A Voice That Will Never Be Forgotten
Peter Cullen may be gone, but his portrayal of Optimus Prime will continue inspiring generations of fans. Through his powerful yet compassionate performance, Cullen helped shape the character as a symbol of courage, leadership and sacrifice.
Perhaps the most fitting way to honor him is through the advice that inspired Optimus Prime in the first place: “Be strong enough to be gentle.” Rest easy, Peter Cullen and, in the words of the Autobots, till all are one.
