She could also do Blackarachnia.

 

People keep mentioning Mark Hamil, that would be a best of both worlds, a super famous live action star and a superb voice actor!

Now if gina torres was to play Blackaracnia, I'm sure the "definitive Joker" could put an excellent spin on a demented live action Tarantulas to torment her!

 

Mark Hamill would be a stupendous Tarantulas.

 

Arnold Schwarzenegger as Blitzwing.

 

Tom Hanks already had a line as Bumblebee.

 

Ok, Peter Weller as Prowl!  

 

I've said it once, I've said it a thousand times: please cast Liam Neeson as Ultra Magnus!

 

Probably Kevin Spacey.
I know he's not a big celebrity, but I'd love for Keith David to voice a Transformer. His epic voice rivals Cullen's in my opinion.

But you know what would be awesome? If Victor Caroli did the narration for one of the movies, at least. Seriously, Victor's voice is criminally underrated.

 

I've said it before and I'll say it once more; Hugh Keays-Byrne NEEDS to voice Megatron in TF5!!

 

I'd love to see Fred Willard back as Swindle in any capacity, even if te emovies have weak, generic Decepticons. If there's ever a spinoff helmed by someone else, I want him back.

 

What are the odd of Mark Ryan voicing Hot Rod... also, Chris Pratt as Bee (when he gets his voice, which I hope he doesn't lol!) seems like a good idea

 

Mark Ryan anything else but Bumblebee, Will Friedle nothing else but Bumblebee.

 

I wish they'd get good actors to voice Crosshairs and Drift.

Clark Gregg or Brent Spiner as Prowl if they followed the G1 tech specs where Prowl is logical and endlessly patient.

Christopher Walken as Swindle.

Bruce Campbell as Springer

The Rock as Cliffjumper

I second Judd Nelson as Hot Rod.

Margot Robbie as Thunderblast

James Earl Jones as Cyclonus

Hugo Weaving as Overlord