He played (the second) Megatron (he named himself after the original one we knew in 1984, 1985, and s on). on Beast Wars Transformers and Beast Machines Transformers.

He then played a different character named Megatron on Transformers Armada, Transformers Energon and Transformers Cybertron.

He was the voice of Professor X, Professor Charles Xavier on that terrible X-Men Evolution program.

He currently is the voice of Optimus Prime on Transformers: Animated.