I don't know who the black robots were, so here's a whole list.
Peter Cullen ... Optimus Prime (voice)
Mark Ryan ... Jetfire (voice)
Reno Wilson ... Mudflap (voice)
Jess Harnell ... Ironhide (voice)
Robert Foxworth ... Ratchet (voice)
André Sogliuzzo ... Sideswipe (voice)
Grey DeLisle ... Arcee (voice)
Hugo Weaving ... Megatron (voice)
Tony Todd ... Fallen (voice)
Charles Adler ... Starscream (voice)
Frank Welker ... Soundwave / Devastator / Reedman (voice)
Tom Kenny ... Wheelie / Skids (voice)
Calvin Wimmer ... Wheelbot (voice)
John Di Crosta ... Doctor (voice)
Michael York ... Prime #1 (voice)
Kevin Michael Richardson ... Prime #2 / Skipjack (voice)
Robin Atkin Downes ... Prime #3 (voice)
Peter Cullen ... Optimus Prime (voice)
Mark Ryan ... Jetfire (voice)
Reno Wilson ... Mudflap (voice)
Jess Harnell ... Ironhide (voice)
Robert Foxworth ... Ratchet (voice)
André Sogliuzzo ... Sideswipe (voice)
Grey DeLisle ... Arcee (voice)
Hugo Weaving ... Megatron (voice)
Tony Todd ... Fallen (voice)
Charles Adler ... Starscream (voice)
Frank Welker ... Soundwave / Devastator / Reedman (voice)
Tom Kenny ... Wheelie / Skids (voice)
Calvin Wimmer ... Wheelbot (voice)
John Di Crosta ... Doctor (voice)
Michael York ... Prime #1 (voice)
Kevin Michael Richardson ... Prime #2 / Skipjack (voice)
Robin Atkin Downes ... Prime #3 (voice)