For generations of Transformers fans, Optimus Prime was more than a giant robot.
He was the calm voice in the middle of chaos. The leader who sounded powerful without needing to shout. The character whose words carried the weight of courage, loyalty and sacrifice.
Much of that identity came from one man: Peter Cullen.

Cullen, the veteran voice actor whose unmistakable baritone became synonymous with Optimus Prime, has died at the age of 85.
The actor reportedly died on Wednesday at his home in Los Angeles. His death was confirmed to the Los Angeles Times on Thursday by his agent, Kevin Motley.
His family said Cullen died peacefully, surrounded by those closest to him, while acknowledging the millions of fans who had come to know his voice over the course of his remarkable career.
“Passed away peacefully, surrounded by his loving family – and held in the hearts of his many friends and countless fans worldwide,” the family said.
They urged those who admired him to remember his legacy not simply through his work, but through the values he embodied.
“Honour his remarkable legacy by serving your communities and leading others with compassion, integrity, and loyalty and always remember ‘be strong enough to be gentle,’” the family added.
The voice behind a childhood icon
Cullen did not simply voice Optimus Prime. He helped define what the character sounded like.
He originated the role in the original 1980s animated Transformers series, popularly known among fans as “G1” or “Generation 1”.
For viewers who grew up with the series, his voice became inseparable from the Autobot leader. Deep, measured and authoritative, it gave Optimus Prime an unusual combination of strength and warmth.
Cullen reprised the role in The Transformers: The Movie in 1986.
Then, more than two decades later, Hollywood brought the Autobots and Decepticons to the big screen.
Cullen returned.
When Michael Bay’s live-action Transformers arrived in 2007, a new generation was introduced to the franchise, but one familiar element remained: that unmistakable voice of Optimus Prime.
Cullen went on to reprise the character in Transformers: Revenge of the Fallen (2009), Transformers: Dark of the Moon (2011), Transformers: Age of Extinction (2014) and Transformers: The Last Knight (2017).
He also returned for Bumblebee in 2018 and Transformers: Rise of the Beasts in 2023.
In an industry where characters can be redesigned, recast and reimagined, Cullen remained the voice audiences continued to associate with Optimus Prime.
But Optimus Prime was only part of the story
It would be easy to reduce Cullen’s career to one character.
That would, however, overlook just how wide-ranging his work was.
Cullen also became the voice of Eeyore, the gloomy but endearing donkey from the Winnie the Pooh universe.
He first played Eeyore in The New Adventures of Winnie the Pooh, which aired from 1988 to 1991, before returning to the character in several other productions, including The Tigger Movie in 2000, Piglet’s Big Movie in 2003 and The Book of Pooh series.
The contrast between Optimus Prime and Eeyore perhaps says something about Cullen’s range.
One character was a towering symbol of leadership and heroism.
The other was a perpetually gloomy donkey whose pessimism became part of his charm.
Cullen made both instantly recognisable.
His film and television credits extended even further. He voiced the giant ape in the 1976 remake of King Kong, played the villainous vehicle KARR in Knight Rider and provided the voice of the alien hunter in the original Predator.
His career also stretched into video games and theme park productions.
A career built long before Transformers
Cullen was born Peter Claver Cullen on July 28, 1941, in Montreal to American parents Henry and Muriel Cullen.
He was one of four children.
Long before he became the voice of one of animation’s most recognisable characters, Cullen trained as a performer.
He graduated from the National Theatre School of Canada in 1963 and went on to perform Shakespeare in Stratford, Ontario.
He later joined the repertory company at Toronto’s Crest Theatre.
That theatrical foundation would eventually become part of the voice that millions came to recognise.
The legacy of a voice
Cullen’s contribution to Transformers was recognised beyond the franchise’s enormous fan base.
He received a Daytime Emmy nomination in 2011 for his work as Optimus Prime in Transformers: Prime.
In 2023, he received a Lifetime Achievement Award at the Children’s and Family Emmy Awards.
But perhaps the most telling measure of Cullen’s legacy cannot be found on an awards shelf.
It lives in memory.
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For some fans, hearing his voice immediately takes them back to Saturday mornings, animated battles, childhood bedrooms and the world of Autobots and Decepticons.
For others, it may be the sound of Eeyore quietly delivering another gloomy observation.
That is the unusual power of voice acting.
An actor can disappear from the screen and still remain present in the minds of audiences because the character survives in sound.
Peter Cullen gave Optimus Prime that kind of permanence.
He lent his voice to a fictional leader, but generations of viewers heard something bigger in it: authority without arrogance, strength without cruelty and leadership tempered by compassion.
His family said he is survived by his four children, Angus, Claire, Pilar and Clay, according to the Associated Press.
Peter Cullen may be gone, but the voice of Optimus Prime is unlikely to disappear anytime soon.
Some voices belong to actors.
Others become part of popular culture.
Cullen’s became both.
