Transformers vs. Predator vs. Alien. Ok, I'm kind of kidding. But seriously, I was looking at the quote in MorePrimeLand's sig from Optimus Prime about approaching the planet with hostile intent and thought, what if the next movie had hostile aliens that weren't even cybertronian? I think that could have potential. But then my next thought was the whole Predator vs. Alien thing so... yeah.