He's bigger on the inside:
http://img258.imageshack.us/img258/808/primus.jpg
PRIMUS: I am the lord, your god! I made you in my image!
LUGNUT: Hi Cybertron!
GIGASTORM: Er... Which one of us did you make in your image? The five-eyed, eight toed robot with no nose and claws for hands, or me - a dinosaur with horns on his face.
PRIMUS: Both of you! I'm... not very good at making stuff.
LUGNUT: So are you the narrator?
PRIMUS: I am the omniscient narrator! I know all and say all!
LUGNUT: So you're the guy who always says "Find out tomorrow in the next exciting episode of Lugnut And His Amazing Friends"?
PRIMUS: Oh... No.
GIGASTORM: But if you know all, then... who is the narrator?
PRIMUS: ... I once made a sandwich so big that even I couldn't eat it! And then I ate it anyway!
GIGASTORM: You don't know, do you?
PRIMUS: Um... No.
NARRATOR: Does Primus know anything? Anything at all? Find out tomorrow in the next exciting episode of Lugnut And His Amazing Friends. Same Nut-time; Same Nut-channel! And tune in next time to hear Tallestblue say...