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Frank Welker
Megatron / Mirage / Rumble / Skywarp / Soundwave (voice)

Gregg Berger
Cliffjumper / Narrator / Spike Witwicky (voice)

Peter Cullen
Optimus Prime / Ironhide (voice)

Frank Todaro
Starscream / Wheeljack / Reflector / Sparkplug Witwicky (voice)

Arif S. Kinchen
Jazz (voice)

Dan Gilvezan
Bumblebee / Shockwave (voice)

Michael Bell
Prowl (voice)

Victor Caroli
Narrator (voice) (archive footage)

Paul Eiding
Hound / Ratchet / Teletraan 1 / Thundercracker (voice) (archive footage)

Corey Burton
Spike Witwicky / Shockwave / Brawn (voice) (archive footage)

Don Messick
Gears / Ratchet (voice) (archive footage)

John Stephenson
Huffer / Thundercracker (voice) (archive footage)

Scatman Crothers
Jazz (voice) (archive footage)

Christopher Collins
Starscream / Wheeljack / Laserbeak (voice) (archive footage)