Frank Welker

Franklin Wendell "Frank" Welker (born March 12, 1946) is an  American actor, who for most of his career has specialized as a  voice actor, best known for his role as  Megatron in the Transformers franchise; specifically  Transformers G1 and  Transformers: Prime, as well as  Fred Jones and  Scooby-Doo from the  Scooby-Doo franchise since its conception in 1969.

He played by Dungeon of Monsters from Grand Chase.