Peter Cullen, the celebrated Canadian voice actor whose powerful baritone brought Optimus Prime to life in the Transformers franchise, died Wednesday, August 26, 2026, at his home in Los Angeles. He was 85.
Cullen’s agent, Kevin Motley, confirmed his death. His family said the actor died peacefully while surrounded by loved ones. A cause of death has not been publicly disclosed.
In a statement, Cullen’s family asked fans to honor his legacy by serving their communities and leading others with compassion, integrity and loyalty. The family also repeated a philosophy closely associated with Cullen and his most famous character: “Be strong enough to be gentle.”
The unmistakable voice of Optimus Prime
Cullen became internationally recognized after being selected to voice Optimus Prime, the courageous leader of the Autobots, in the original animated television series The Transformers in 1984.
Before auditioning, Cullen reportedly knew only that he would be reading for the role of a truck. After learning that Optimus was supposed to be a noble and heroic leader, he based the character’s voice and personality on his older brother Larry, a U.S. Marine who had served in the Vietnam War.
Cullen remembered his brother as a calm, disciplined and compassionate man. Instead of making Optimus sound like a conventional action hero, he gave the character a measured and authoritative voice that communicated wisdom, strength and kindness.
That creative decision helped transform Optimus Prime into one of the most recognizable characters in animation history. For generations of viewers, Cullen’s voice became inseparable from the Autobot leader.
Although the original animated series lasted only several years, the Transformers brand continued through toys, comic books, television programs, video games and films. Cullen returned to the role repeatedly throughout his career.
He voiced Optimus Prime in Michael Bay’s 2007 live-action Transformers movie and continued in several sequels, including Revenge of the Fallen, Dark of the Moon, Age of Extinction and The Last Knight. He also appeared in Bumblebee and 2023’s Transformers: Rise of the Beasts.
From Optimus Prime to Eeyore
While Optimus Prime was his signature role, Cullen’s career extended far beyond the Transformers franchise.
He became well known to younger viewers as the voice of Eeyore, the gloomy but lovable donkey from Disney’s Winnie the Pooh. Cullen voiced the character in numerous television programs, films and video games, including The New Adventures of Winnie the Pooh, which aired from 1988 until 1991.
The two characters demonstrated Cullen’s impressive vocal range. Optimus Prime sounded commanding, confident and heroic, while Eeyore spoke with a slow, weary and deeply sympathetic voice.
Cullen also portrayed the villainous artificial-intelligence vehicle KARR in the television series Knight Rider. His other credits included work on The Smurfs, multiple G.I. Joe productions and Chip ’n Dale: Rescue Rangers.
Some of his most unusual work did not involve spoken dialogue. Cullen supplied vocal effects for King Kong in the 1976 remake starring Jeff Bridges. He also created the distinctive clicking sounds of the alien hunter in the 1987 film Predator. Cullen said he developed the sound after imagining a dying horseshoe crab.
A career spanning more than six decades
Peter Claver Cullen was born in Montreal, Quebec, on July 28, 1941. He studied at Canada’s National Theatre School and began his professional career in radio and Canadian television.
His early American entertainment work included serving as an announcer for The Smothers Brothers Comedy Hour in the late 1960s. He later worked on The Sonny & Cher Comedy Hour before becoming one of the entertainment industry’s most prolific voice performers.
Cullen received a Daytime Emmy nomination in 2011 for portraying Optimus Prime. In 2023, the National Academy of Television Arts and Sciences honored him with a Lifetime Achievement Award at the Children’s & Family Emmy Awards.
Despite receiving prestigious recognition, Cullen often appeared most affected by his personal interactions with fans. At conventions, he met adults who had grown up listening to Optimus Prime and later introduced the character to their children.
Cullen said fathers sometimes became emotional when meeting him, showing how deeply his performance had influenced their childhoods.
A voice that inspired generations
Peter Cullen did more than provide the voice of an animated robot. Through Optimus Prime, he represented a particular idea of leadership—one built on courage, responsibility, loyalty and compassion.
His interpretation of the character taught audiences that strength did not require cruelty and that a powerful leader could also be patient and gentle. That message helped his performance remain meaningful long after the original cartoon ended.
Cullen is survived by his four children, Angus, Claire, Pilar and Clay.
His death closes an extraordinary chapter in animation and popular culture, but his voice will continue to be heard in decades of television episodes, movies and video games. For millions of fans around the world, Peter Cullen will forever remain the voice of Optimus Prime.
