The Fallen (Tyran)

Live-action continuity
The Fallen is an ancient Transformer. He's one of the original members of the mechanical alien race, and his defiance and arrogance led to his banishment into another dimension.

Transformers: Revenge of the Fallen
Yo dude who runs this site fix your info Tony Todd is voicing the Fallen not Nimoy if you want proof it was confirmed that Todd was voicing a character in the movie a while back and officially proven when the movie premiered in Tokyo the other day you're welcome