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Franklin Wendell Welker is the full name of American voice actor Frank Welker. He has been in the voice acting industry for over 50 years and has voiced over 1,000 characters. He is best known for his work on the Transformers franchise, where he voiced Megatron, Optimus Prime, and many other characters. He has also voiced characters in Scooby-Doo, The Smurfs, The Simpsons, and many other shows.