As We, the fans Know That the Transformers Robot cast was part in the Film Franchise. And they needed voice actors to perform, as confirmed by Mr. bay himself. They come in, follow along their lines, and add them to the final cut. Here's the enitre voice cast: Peter Cullen - Optimus Prime Hugo Weaving - Megatron Mark Ryan - Bumblebee (TF 2007), Jetfire Charlie Adler - Starscream (Silverbolt in The Transformers) Darius McCrary - Jazz Robert Foxworth - Ratchet Jess Harnell - Ironhide, Barricade (1st Voice) Jimmie Wood - Bonecrusher, Crowbar Reno Wilson - Frenzy, Mudflap, Brains Tom Kenny - Skids, Wheelie (Starscream in Animated) Andre Sogliuzzo - Sideswipe (1st Voice) Grey DeLisle - Arcee Frank Welker - Soundwave, Devastator, Reedman, Shockwave, Barricade (2nd Voice) John Di Crosta - The Doctor AKA Scalpel Calvin Wimmer - Demolisher Tony Todd - The Fallen Robin Atkin Downes - Prime #1 Kevin Michael Richardson - Prime #2, Rampage, Hatchlings (1st voice of Omega Supreme in Animated, Bulkhead in Prime) Michael York - Prime #3 Leonard Nimoy - Sentinel Prime (Galvatron in The Transformers: The Movie) Keith Szarabajka - Laserbeak (Ironhide in War For Cybertron) James Remar - Sideswipe (2nd Voice), (Transformers: Prime Voice actor) Francesco Quinn - Mirage/Dino (Final Role right before his death) George Coe - Wheeljack/Que John DiMaggio - Leadfoot (Sideways in the ROTF Video Game) Ron Bottitta - Roadbuster Greg Berg - Igor Here is the voice cast that did not appear in DOTM: A January 2010 interview with actor James Avery claimed that he would be providing the voice of an Autobot named "Silverbolt" in the film, but no such character appeared in the finished movie. Similary, a January 2011 article in the Idaho Times-News claimed that Bill Fagerbakke, who voiced Bulkhead in Transformers Animated, would be voicing one of the Wreckers, but the actor's voice did not appear. Oh and Colleen O'Shaughnessey did not voice Chromia in ROTF and she was not Uncredited. Some guy called Mark Marino put up that little fib online on the internet.