With the surge of pictures, videos and reports from the Transformers 2 set involving Shia LaBeouf, Megan Fox and friends, it is easy to forget that there are other cast members who are as equally important (although not as youthful or good looking, hence the voice work). Peter Cullen, the voice of Optimus Prime, used his vocal cords to give MTV an update on his Transformers 2 work.

“I’ve only done the opening,” voiceover legend Peter Cullen told MTV News, updating us on the lengthy process of recording lines for the film. “[Michael] Bay brought me in to get them started on some of the animation part of it. I think they require a voiceover for it, [and then] we’ll get into the main stuff more towards the end of the fall…November, perhaps.”

And while Cullen will remain off-camera, like in the first film, some of him will find a home on the synchronized face of his alter-ego, Prime. “They focus a camera on my mouth,” he exclaimed. “It’s like ‘Oh my God, they’re looking into my mouth!’ It’s like going to the dentist.”