Peter Claver Cullen (July 28, 1941 – August 26, 2026) was a Canadian voice actor. He voiced Optimus Prime in the original 1980s Transformers animated series, later returning to the role in Transformers media in 2007, starting with the first live-action film. He also voiced many other characters across a wide variety of popular media, including Eeyore in the Winnie the Pooh franchise, Monterey Jack in Chip 'n Dale: Rescue Rangers, the first voice of KARR in Knight Rider and the vocalizations of the title character in Predator. He also voiced Thaedus in the animated series Invincible.
Cullen was presented with a Lifetime Achievement Award by the National Academy of Television Arts and Sciences in 2023 as part of the 2nd Children's and Family Emmy Awards.
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Early life
Peter Claver Cullen was born on July 28, 1941 in Montreal, Quebec, Canada. His father Henry Laurence Cullen (1905 – 1971) was from Boston, Massachusetts and his mother Muriel Margaret (née McCann) Cullen (1907 – 1973) was from Providence, Rhode Island and also grew up in Yonkers and New York City. Cullen's family was of Irish descent, and he had three siblings. Cullen's father was the founder and President of Canadian Overseas Paper Company, Ltd and also served as Senior Vice President and director of the International Paper Sales Company. His mother was a graduate of the American Academy of Dramatic Arts. His maternal grandfather was Alfred W. McCann who was a muckraking journalist.
Cullen spent his early childhood living in Montreal. Growing up, he spent his summers on his aunts farm in New York. He said he used to imitate the animals while working there on the farm and also used to imitate his teachers at school. Cullen's family later moved to Kingston, Ontario where he attended Regiopolis-Notre Dame Catholic High School. He was part of the first graduating class of the National Theatre School of Canada, completing his studies in 1963. His brother, Larry Cullen, a retired captain in the United States Marine Corps, helped inspire Cullen's later voice performance as Optimus Prime.
Career
1963–1970
Following his graduation, Cullen worked for a year as part of the Crest Theatre Foundation repertory company. Finding the dramatic stagework too serious for him, he quit the theatre and returned to Montreal, where he spent a year working in a gas station to "get back to his roots." During this time, he performed in comedic, musical stage plays, beginning with the 1964 revue Up Tempo.
In late 1964 and early 1965, Cullen landed his first television jobs, performing in plays for TV in one episode of Action Theatre and two episodes of Shoestring Theatre. In Spring 1965, he performed in another comedy musical titled Mon'ey, during which he befriended his co-star, American comedian and local children's TV star Ted Zeigler. The two men became fast friends and formed a comedy partnership. From February to December 1966, Cullen worked a steady job as the host of the "Milkman's Maintee" overnight program on radio station CKGM, but would leave the job a few months after landing his first recurring TV role in Zeigler's new 1966 series, Johnny Jellybean and Friends, which aired every weekday on Montreal's CFCF-TV from August 1966 to March 1967. The two men teamed again for the 1967-1968 show, The Buddies, in which Cullen played a French-Canadian astronaut character named Commander Bi Bi Latuque.
From 1967 to 1971 Cullen and Zeigler teamed with actors Joan Stuart and Barry Baldaro to form the cast of CBC Radio 's new sketch comedy series, Funny You Should Say That. Cullen and Stuart notably performed the show's most popular sketch, L'Anglaise, as French-Canadian man Giles and his English-Canadian wife Penelope. The radio show would spawn numerous TV spin offs—1969's Comedy Cafe, 1970's Comedy Crackers, and 1970-71's Zut!—in which Cullen featured.
Cullen is widely but incorrectly credited as having been the announcer of Los Angeles-filmed series The Smothers Brothers Comedy Hour during these years; in fact, the announcer of this series was Roger Carroll, and it completed its entire 1967-1969 run before Cullen ever left his native Canada.
1971-1980
In 1971, Cullen was signed by Schlatter-Friendly Productions to star in a pilot for a new comedy series, It's a Wacky World, for NBC which led to him relocating to Los Angeles. The pilot bombed and the series wasn't picked up, but Cullen was able to instead secure work as both announer and on-screen performer on The Sonny & Cher Comedy Hour, on which he appeared from 1971 to 1974 alongside his old co-star Zeigler. From 1974 to 1975, he, Zeigler and fellow Sonny & Cher performer Billy Van were regulars on The Hudson Brothers Razzle Dazzle Show, which Cullen also narrated.
On-screen work for Cullen would lessen after this; subsequent on-camera roles included a recurring part as the character "Luke Warm" on the short-lived summer 1975 series Down Home Country on the CBC back in Canada, a brief appearance in the 1978 TV film Ringo, and his last known screen credit, the CBC Halloween special "Boo!" in 1980. During these years, he would expand into voiceover work, including a commercial for Betty Crocker Snackin' Cakes, and the 1977 album, "The Story of Halloween Horror," until eventually, he decided to give up on-camera work and focus entirely on voice work, after being approached by talent agent Steve Tisherman who offered to represent him if he would dedicate "one hundred percent of his time" to voiceover.
As Optimus Prime
Cullen recalled auditioning for the role of the robot character Optimus Prime at a casting house in Burbank, California, explaining that as he read Prime's character breakdown, he saw that it was "the opportunity of the year", and heeded his brother Larry's advice: "Peter, don't be a Hollywood hero, be a real hero. Real heroes don't yell and act tough; they're tough enough to be gentle, so control yourself." Cullen later learned from his agent, Steve Tisherman, that he not only won the part of Prime, but also, to his surprise, the role of Ironhide as well, which he saw as a "home run".
He stated that Optimus was his favorite voice role, and that he based the voice of the Autobot leader on his older brother Larry, who served in Vietnam. "When he came home, I could see a change. He was quieter and he was a man and a superhero to me," says the actor. "I watched him and listened to him. I'd never had an opportunity to do a superhero, and when that came, [that voice] just came right out of me and I sounded like Optimus."
Cullen also stated that he had no idea of Prime's popularity until the character's controversial death in the 1986 animated film, because the studio had never given him fan letters from children addressed to Optimus. The public backlash over Optimus's death surprised producers greatly. Children were leaving the theaters distraught because of the character's death. The writers temporarily revived the character for a single episode in Season 3 called "Dark Awakening". Initially, this was intended to be his final appearance, but after fan requests continued, "The Return of Optimus Prime", a two-part episode was produced. The original ending of "Dark Awakening" was altered in reruns to include a teaser about the return of the character, and indeed, Optimus returned once and for all to lead the Autobots for the final five episodes of the original American cartoon series.
He reprised the role of Optimus Prime in the 2007 Transformers live-action film, the sequels Revenge of the Fallen, Dark of the Moon, Age of Extinction and The Last Knight, Bumblebee and Rise of the Beasts and the video games based on the film series. Though he was only contractually obligated to voice Optimus up to The Last Knight, producer Lorenzo di Bonaventura stated in 2021 that Cullen was welcome to voice the character for as long as he wanted. His final performance as the character would be Optimus Prime: Awakening in 2026.
Other work
In the 1980s to the 1990s, Cullen appeared on a number of television shows. He had played Coran, Stride the Tiger Fighter, and King Alfor in the Lion Voltron series, the transforming spaceship/robot Ramrod, the heroic Commander Eagle and the villainous Nemesis in the 1980s anime series Saber Rider and the Star Sheriffs, Commander James Hawkins in the Vehicle Voltron series, Eeyore in the Winnie the Pooh franchise, the original voice of KARR in Knight Rider, Antor and Bomba, and Gunner, in Dino-Riders, Airborne, Zandar and Nemesis Enforcer in G.I. Joe. He played Mantor/Mantys in Coleco's 5 episode mini-series Sectaurs in 1986; Red Skull in Spider-Man (1981), Klaar and Zanzoar in Megas XLR and Mantus in The Pirates of Dark Water. He also had a voice part in the 1984 motion picture Gremlins (as a gremlin) and in the first season of the 2008 Knight Rider series, where he reprised his vocal role as KARR (from the original Knight Rider series). He also did voicework in The Greatest Adventure: Stories from the Bible series, notably as Japheth, one of Noah's sons in the "Noah's Ark" episode, and the King of Nineveh in the "Jonah" episode. He was well-known by some as the main villain Venger in the animated series of Dungeons & Dragons. He played the evil sorcerer Renwick in Little Wizards and Cindarr in Visionaries: Knights of the Magical Light.
Among many other television series and films, he also lent his basso voice to many film trailers and television commercials, including announcing for the Toonami and You Are Here blocks on the Cartoon Network.
He voiced Nintendo's mascot Mario in the Donkey Kong segments on the 1983–1984 TV series Saturday Supercade, making him the first person to ever provide a voice for the character in western media.
Cullen did voicework on drum and bass DJ Dieselboy's 2004 album, The Dungeonmaster's Guide, and narration on the 2013 album Tetragrammaton by the Dutch extreme metal band The Monolith Deathcult. Tetragrammaton also featured Cullen on bass in "God's Among Insects." Additionally, he did voicework for the unreleased Blizzard Entertainment game Warcraft Adventures: Lord of the Clans, and provided narration for the Star Wars fan film series I.M.P.S.: The Relentless.
Cullen was a voice announcer on Police Story 4: First Strike in advertisements for New Line Cinema.
Personal life and death
Cullen was Catholic. Cullen married former Miss Canada Carol Ann Balmer in 1968, with whom he had two children, Clay (born 1971) and Claire (born 1977). The couple divorced in 1982.
Cullen would later remarry and have two further children, Angus and Pilar, with his wife Brandi Cullen. At the time of his death, he had three grandchildren. He was a fan and supporter of NASA, citing the Apollo 11 Moon landing in 1969 as the start of his interest.
Cullen died of cardiac arrest complicated by respiratory arrest and lung cancer at his home in Los Angeles, California, on August 26, 2026, at the age of 85. He was buried at Forest Lawn Memorial Park in Hollywood Hills on September 9. Many fans and co-stars paid tributes to Cullen.
Honours
At BotCon 2010, Hasbro named Cullen as one of the first four human inductees in the Transformers Hall of Fame for his role as the voice of Optimus Prime.
