The Canadian voice actor gave Optimus Prime his legendary baritone and also voiced Eeyore, KARR, Monterey Jack, and the Predator’s distinctive sounds.
Peter Cullen, the Canadian voice actor whose unmistakable deep voice became synonymous with Optimus Prime in the Transformers franchise, has died at the age of 85.
Cullen died Wednesday, August 26, at his home in Los Angeles, according to his agent Kevin Motley. His family said he died peacefully surrounded by his loved ones and remembered him as an artist whose work reached countless fans around the world.
“Peter Cullen passed away peacefully, surrounded by his loving family — and held in the hearts of his many friends and countless fans worldwide,” his family said in a statement.
The family asked fans to honor Cullen’s legacy by serving their communities and leading others with compassion, integrity and loyalty, while remembering the message: “Be strong enough to be gentle.”
For more than four decades, Cullen’s voice was closely associated with some of the most recognizable characters in animation and popular culture. He first became Optimus Prime in the original Transformers television series in 1984 and later returned to the role for Hollywood films, animated series and video games.
He was also the longtime voice of Eeyore in the Winnie the Pooh franchise and performed numerous other memorable roles, including KARR in Knight Rider and Monterey Jack in Chip ‘n Dale: Rescue Rangers.
The voice of Optimus Prime
Cullen’s defining role began in 1984, when he was cast as Optimus Prime in the original syndicated Transformers animated series.
The character was the heroic leader of the Autobots, and Cullen gave him a deep, authoritative voice that became one of the most recognizable performances in animated television.
Interestingly, Cullen did not initially know exactly how he would approach the character.
In a 2014 NPR interview, he recalled that when he auditioned, he was simply told that the character was “a hero” and “a truck.”
He eventually won the role and also voiced another Autobot, Ironhide.
Cullen later revealed that the inspiration for his Optimus Prime performance came from his older brother, Larry Cullen, a decorated U.S. Marine who served in Vietnam from 1965 to 1968.
Larry’s personality changed after returning from Vietnam, Cullen recalled. His brother was quieter and, to Cullen, represented the qualities of a real-life hero.
Larry advised him not to play Optimus as an exaggerated Hollywood hero.
Instead, he encouraged Cullen to portray a character who was powerful but controlled and compassionate.
That advice became central to the voice.
Cullen later explained that the idea of being “strong enough to be gentle” stayed with him when he developed Optimus Prime’s voice.
Optimus Prime’s controversial death brought Cullen back
Cullen’s performance became particularly important to Transformers fans after Optimus Prime was killed in the 1986 animated film The Transformers: The Movie.
The character’s death produced a major emotional reaction from audiences, particularly children.
The response was so strong that Optimus Prime was eventually brought back into the story.
Cullen returned to voice the character as Optimus was restored to the Transformers universe.
The experience demonstrated just how strongly Cullen’s voice had become connected to the character.
From the animated series to Hollywood
When the Transformers franchise moved to live-action cinema in 2007, Cullen was brought back to voice Optimus Prime in Michael Bay’s film.
The movie starred Shia LaBeouf and introduced the franchise to a new generation of moviegoers.
For Cullen, returning to Optimus after more than two decades felt surprisingly natural.
He compared the experience to putting on a familiar pair of comfortable shoes that he had not worn in years.
The 2007 Transformers movie became a major worldwide success, grossing approximately $709.7 million worldwide.
Cullen subsequently returned for:
- Transformers: Revenge of the Fallen (2009)
- Transformers: Dark of the Moon (2011)
- Transformers: Age of Extinction (2014)
- Transformers: The Last Knight (2017)
- Bumblebee (2018)
- Transformers: Rise of the Beasts (2023)
He also voiced Optimus Prime in numerous animated projects and video games.
The first three major sequels were particularly successful at the global box office. Revenge of the Fallen grossed about $836.3 million, while Dark of the Moon and Age of Extinction each crossed the $1 billion mark worldwide.
Chris Hemsworth voiced Optimus Prime in the 2024 animated film Transformers One, but Cullen remained the definitive voice of the character for generations of fans.
Eeyore was another signature role
Although Optimus Prime was Cullen’s most famous role, it was not the only character for which audiences immediately recognized his voice.
Cullen was also the voice of Eeyore, the melancholy donkey from the Winnie the Pooh franchise.
He began voicing Eeyore in The New Adventures of Winnie the Pooh, which ran from 1988 to 1991.
He later continued portraying the character in movies, television productions, specials, videos and other Winnie the Pooh projects.
The contrast between his two most recognizable characters was striking.
As Optimus Prime, Cullen provided a commanding voice for a heroic leader. As Eeyore, he created a much quieter and melancholy personality.
Cullen once described the reaction he received from children who recognized him through Eeyore’s voice.
He would sometimes simply say, in Eeyore’s voice, “Hello. Thanks for noticing me,” and children would immediately recognize the character.
He created the Predator’s terrifying sounds
Cullen’s talents extended beyond traditional voice acting.
He also helped create the distinctive vocal effects of the alien creature in the 1987 Arnold Schwarzenegger film Predator.
Cullen auditioned for the project after being encouraged by his agent.
At the time, he had been working long hours on another project and was reportedly coughing up blood, but he still went to the audition.
The filmmakers initially wanted to keep the appearance of the Predator secret from him.
Cullen insisted that he needed to see the character in order to understand how he should perform the sounds.
When he finally saw the creature, he described its appearance as disturbing and compared it to an upside-down horseshoe crab dying on a beach.
He then developed the clicking, bubbling and crackling sounds that became part of the Predator’s identity.
King Kong, KARR and many other characters
Cullen’s voice work reached far beyond Transformers and Winnie the Pooh.
He provided the vocal performance for King Kong in the 1976 remake.
He also voiced KARR, the evil counterpart to KITT, in the original Knight Rider series and later returned to the character for the 2008–09 television series.
His animation credits included Monterey Jack in Chip ‘n Dale: Rescue Rangers.
He also performed characters in productions including:
- Voltron
- G.I. Joe
- Dungeons & Dragons
- Spider-Man
- Dino-Riders
- Saber Rider and the Star Sheriffs
- The Pirates of Dark Water
- Visionaries: Knights of the Magical Light
- DuckTales
- Alvin & the Chipmunks
- My Little Pony
- The Greatest Adventure: Stories from the Bible
- Gremlins
- Megas XLR
- Rise of the Teenage Mutant Ninja Turtles
He also voiced Mario in the Donkey Kong segments of Saturday Supercade, making him the first performer to provide the character’s voice in Western media.
In later years, Cullen joined the animated series Invincible, where he voiced Thaedus.
Cullen’s career started long before Optimus Prime
Cullen was born Peter Claver Cullen on July 28, 1941, in Montreal, Quebec, Canada.
He was one of four children born to Henry and Muriel Cullen.
His professional career began long before he became a household name among Transformers fans.
As a young performer, he studied acting at the National Theatre School of Canada and was part of its first graduating class in 1963.
He also studied under operatic coach Bernard Diamant and performed Shakespeare in Stratford, Ontario.
Cullen worked in radio in Montreal and served as an announcer for CKGM.
He also appeared on Canadian television before moving toward Hollywood.
His early television work included the children’s program The Buddies, where he played an astronaut character named Commander Bi Bi Latuque.
Hollywood and television work
After moving to Hollywood, Cullen became an announcer and performer on programs including The Smothers Brothers Comedy Hour.
He later appeared on The Sonny & Cher Comedy Hour and The Hudson Brothers Razzle Dazzle Show.
These early live-action and announcing jobs helped him develop the vocal control that would eventually become central to his career.
Over time, voice acting became his primary field.
His exceptionally deep basso voice also made him a popular choice for movie trailers, television commercials and promotional announcements.
He worked with Cartoon Network and contributed announcing work for programming blocks including Toonami.
His Optimus Prime performance earned Emmy recognition
Cullen’s work continued to receive recognition decades after he first became Optimus Prime.
His performance in the first season of Transformers: Prime earned him a Daytime Emmy nomination in 2011 for Outstanding Performer in an Animated Program.
In 2010, Hasbro also inducted Cullen into the Transformers Hall of Fame as one of the first human inductees, recognizing his importance to the franchise.
In 2023, he received a Lifetime Achievement Award at the Children’s & Family Emmy Awards.
The honor recognized a career that had stretched across television, film, animation and video games.
A lasting connection with NASA
Cullen also had a long-standing interest in space exploration.
He became a supporter of NASA after being inspired by the Apollo 11 Moon landing in 1969.
He was involved with the Optimus Prime Spinoff Award, which recognizes young people pursuing studies related to space, science, technology and mathematics.
That connection reflected another side of Cullen’s legacy: his work as Optimus Prime inspired generations of children beyond entertainment.
His voice became part of pop culture
One of the most remarkable aspects of Cullen’s career was that his face was not always visible to the audience.
His voice alone could instantly identify a character.
For Transformers fans, the deep voice of Optimus Prime became inseparable from the character’s image as a leader who valued courage, loyalty and compassion.
For Winnie the Pooh audiences, the same performer created Eeyore’s distinctive melancholy personality.
And for movie audiences, his vocal effects helped make the Predator one of the most recognizable creatures in science-fiction cinema.
Cullen once reflected on the impact of Transformers and his role in it, describing the phenomenon as something that had become part of his life.
He said he was grateful and humbled that he had done something that stood out.
Peter Cullen’s family
Cullen is survived by his four children: Angus, Claire, Pilar and Clay.
His son Clay worked as a stunt performer and coordinator.
Cullen’s family has asked fans to remember him not only for his famous characters but also for the values associated with the Optimus Prime character he helped define: compassion, integrity, loyalty and strength without cruelty.
Peter Cullen died on August 26, 2026, at his Los Angeles home.
He was 85.
But his voice will continue to live on through one of animation and popular culture’s most recognizable characters.
For generations of Transformers fans, Optimus Prime will always sound like Peter Cullen.
