I deleted my first post, so I could write a "better" one, as to what I'd like to see in a TF movie someday. I'd like to see the fourth movie revolve around the Transformers, and the spotlit villain/s be the Quintessons, with the subplot being the necessity of all the transformers to combine forces to deal with the larger threat.
Of all the Transformer universe baddies, the Quintessons truly are dangerous on a singular basis, not to mention when faced en-masse.
The best thing about the Quintessons, is that these evil beings actually have a legitimate gripe against all Transformers, because they created them, but in turn their creations rebelled against them, and stole the planet that they created.
Granted, they were bad creators, and abused their "children", but in a twisted way, you can kind of have some
sympathy for them. I know if I created a toaster and it not only burned my finger, but also drove me out of my house, I'd not have any empathy/sympathy, and want to destroy it too.
Now we come to The Allspark. In my movie, the Quintessons created the Allspark, to them it's just another tool, and not some mystic godlike thing that grants life. That's how the Quints could have created such a large manufacturing planet, and both the products of military hardware, and consumer goods so easily.
During the robot rebellion, (bringing Alpha Trion into play) the first of the Primes stole the Allspark from their masters, hence the writing of the Primes covering the cube. Since the cube would have been so old, it would only stand to reason that through the ages the language, not to mention the history surrounding it would have been lost from memory.
All the while the Quintessons have been scheeming on the edge of the universe waiting for the right time to strike, and destroy their creations. Tracking the allspark's energy signature to Earth (from the first movie) they move in to take complete and total ruthless revenge on their creations, and the planet that has been harboring them, Earth.
Of course, there will be plenty of opportunities for the Decepticons to doublecross and doubledeal with both the Quintessons and the Autobots, but from the G1 show, it's highly evident that not only are the Quintessons a dangerous breed, they're a competent enemy, and not so easily trifled with, because their evil doesn't spring from their physical prowess, the evil is inside. Bing bong bing.