Peter Cullen

as Optimus Prime (voice)

Frank Welker

as Megatron (voice)

Mark Ryan

as Bumblebee (voice)

Patrick Hallahan

as Starscream (voice)

Brian Stepanek

as Blackout / Agent Simmons (voice)

Kevin Dunn

as Ron Witwicky

Patrick Viall

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

Justin Foley

as Additional Voices (voice)