Suggestions by @bumbleprime

Steve Blum

as Starscream in Transformers

Jeffrey Combs

as Ratchet in Transformers

Frank Welker

as Soundwave in Transformers

Oscar Isaac

as Smokescreen in Transformers

Chris Hemsworth

as Ironhide in Transformers

Ralph Fiennes

as Megatron in Transformers

Zac Efron

as Bumblebee in Transformers

Jeff Bergman

as Bugs Bunny in Cartoon World: Revenge Of The Witch

Chris Pratt

as Tailgate in Transformers Live Action Reboot Franchise

Danny McBride

as Warpath in Transformers Live Action Reboot Franchise

Christian Bale

as Unicron in The Transformers

Ralph Fiennes

as Unicron in The Transformers

Liam Neeson

as Unicron in The Transformers

Michael Fassbender

as Unicron in The Transformers

Andy Serkis

as Doctor Arkeville in The Transformers

Scarlett Johansson

as Arcee in The Transformers

Peter Cullen

as Vector Prime in The Transformers

Henry Cavill

as Nova Prime in The Transformers

Sam Worthington

as Lugnut in The Transformers

Chris Pine

as Prowl in The Transformers