Yes, he voiced Optimus Prime when Prime was resurrected towards the end of Season 3. But as for any other voices, that I don't know.
Why look it up when you can just start a new thread? Basically, according to this, Cullen was out of work throughout most of season 3. He only had a guest appearance as zombie Prime in "Dark Awakening" (which originally aired early in season 3, and was only moved to the end for reruns, mind you), and then took over multiple roles again when Prime returned in "The Return of Optimus Prime" and remained on the show for "The Rebirth".
I thought that was season 4. Who said Wikipedia was accurate 100% of the time? Looks like Visionaries put food on his plate in '87.
Who said anything about Wikipedia? And with "out of work", I was only referring to Transformers, since that was your question.
-Five Faces of Darkness Part 4 -Dark Awakening -Return of Optimus Prime Parts 1&2 I'm not sure if he had any other speakig role in season three.
I dont know if he had many speaking roles in season 3 but i do know that i must hug the man for making my childhood awesome by voicing prime
Peter cullen was in season 4,rebirth parts 1-3. I also think Peter Cullen "might" have been in that season 3 episode called "burden hardest to bear." in the scene where Galvatron puts the matrix of leadership inside his laser canon,then tries to destroy it. the laser canon malfunctions & smoke appears. there are several ghost leaders from within the matric telling galvatron to return the matrix to it's owner. Optimus Prime clearly speaks as one of the ghost leaders.