My neice and nephew was watching the kids show pucca on toon disney yesterday. I wasn't watching untail my nephew told me optimus prime is on tv. I looked and sure Enough a spoof of powermaster prime was on there. I used the dvr to rewind and found out the episode was called "sooga size me". The scene had the bad guys transform a bus into the prime lookalike. He was white and had his faceplate also! Wish i had a picture but i don't.
Aw, man! I saw that was on yesterday and wanted to watch on a hunch but they dropped Toon Disney from our regular service.
I googled the show, and it has some Transformers voice actors in it...interesting. LINK You can watch the episode here. The episode in question is near the end. For what it's worth, I don't think it looks anything like Powermaster Prime. Edit: I just watched the part with the robot, and it is pretty danged funny. He pimp slaps the little girl through a wall...I've never seen this show before, but its pretty funny.