Peter Cullen as Optimus Prime in both the origional (Gen1) TV cartoon which is why he was the best for the movie. No other voice made the Character like Prime's.
I would have to say Peter Cullen and the guy who voiced Starscream. (R.I.P.)
I just happened to notice that Peter Cullen also voices Eeyore on the Disney show, "My Friends Tigger and Pooh". (The things I notice while watching TV with my daughter!) LOL
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