Transformers: Beginnings

Peter Cullen

Optimus Prime (voice)

Frank Welker

Megatron (voice)

Mark Ryan

Bumblebee (voice)

Patrick Hallahan

Starscream (voice)

Brian Stepanek

Blackout / Agent Simmons (voice)

Kevin Dunn

Ron Witwicky

Patrick Viall

Capt. Archibald Witwicky / Barricade / Additional Voices (voice)

Justin Foley

Additional Voices (voice)