Frank Welker is best known for voicing Fred Jones in the Scooby-Doo franchise since its inception in 1969, and Scooby-Doo himself since 2002. He also voiced numerous incarnations of Megatron, Soundwave, Skywarp, Shockwave, Galvatron, and more in the Transformers franchise. Peter Claver Cullen 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.
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