Here what micheal bay says below...... Why do you want to do it? I was under the impression that you were done after "Transformers 3"? I thought I was done. Then the ride came out [at Universal Studios Hollywood] and the two-and-a-half-hour lines. And then you're thinking, Oh my God, someone's going to take this over. And you start doing a lot of soul-searching. Like, OK, I'm about to do a little movie, "Pain & Gain" ... and the studio says they want to restart the franchise. And someone could come in here and screw it up, you know? So I'm thinking that if I do this last one, we set it on a new footing, we change a lot of things -- but we keep the history of the three in place. But we broaden it so it can be set up and be carried on -- it would have a better chance for survival, I guess. You know? Right. So it was just one of those things. It's like, when you look what's going on in the film business with the franchise frenzy right now, why is Cameron doing two more "Avatar" movies? Why is Peter Jackson doing three more "Hobbit" movies that are in the same world as "Lord of the Rings"? When you have a franchise, it's very hard to give it up. My TF fan comments..... Sir,I don't think anyone can screw up the TF movie francise the way you've been doing since 2007. You have nothing to worry,I doubt anyone can do a worser job than you even if they tried really hard to. Those other movie francises you quoted like avatar & lord of the rings. are not in the same league as your horrible TF live movies are. they don't even belong in the same sentence. Those other francise movies actually have decent dialogue,top rated actors as the stars,decent stories & plots. unlike your TF live movies that are un-watchable garbage. they don't resort to potty humor,stero type & nerd mocking humor or nickelodeon humor to ruin their movies like you have do. those other francise movies you mentioned are watchable masterpieces. Peter Cullen returning was expected. Hopefully he's the only returning Transformers robot character from the movie verse. I want a new cast of transformers robots on both sides. Bumblee better be dead,MIA or another mission off of earth.