Which actor is best known as the voice of Optimus Prime in the 1980s "Transformers" animated series?

Peter Claver Cullen (born July 28, 1941) is a Canadian voice actor. He is best known as the voice of Optimus Prime in the original 1980s Transformers animated series, and most other incarnations of the character.

He has also voiced a large number of 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, and The Original First Voice of KARR in Knight Rider. In 2007, Cullen returned to the role of Optimus Prime in various Transformers media, starting with the first live-action film.

The Transformers is an American animated robot superhero television series which originally aired from September 17, 1984 to November 11, 1987. The first of many series in the Transformers franchise, it was based upon Hasbro's Transformers toy line (itself based upon the Diaclone and Microman toy lines originally created by Japanese toy manufacturer Takara) and depicts a war among giant robots that can transform into vehicles and other objects.

Optimus Prime, known in Japan as Convoy, is a fictional character from the Transformers franchise. He is a Cybertronian, an extraterrestrial species of sentient self-configuring modular robotic lifeforms (e.g.: cars and other objects), a synergistic blend of biological evolution and technological engineering.