ok I gt tired of repeating how number 4 can indeed work without Megatron, Starscream and Soundwave in it. i've put this in about 20 threads but here it is AND as an added bonus I've even set up #5 for you. The Decepticons start battling each other trying to decide who is going to lead them (like in 86 movie), they start to scavenge the earth for energon deposits trying to one up each other to prove they are worthy to lead. While the Decepticons are having their own little civil war, the earth's resources and humans are paying the price. It becomes more difficult for humans to tell the good guys from the bad guys and thus have half the humans against the transformers and the other half for the transformers (like the go home signs we saw in Chicago and the "hope" signs with a pic of Optimus or Bee in Chicago) The autobots only being an army of 8 are too little to stop the hundreds of decepticons all over the earth. But they manage to beat them somehow just as they choose a mysterious, familiar leader/character. and here is how you set number 5 up. at the end the sky starts to darken, everyone looks up to see a giant planet entering earths atmosphere. (I personally don't like Unicron but hey its a way to get number 5), Optimus himself looks up to see what darkens the earth and......cut to credits and insert Linkin Park song.