Transformers Revenge of the Fallen

Still wondering about who is the fallen from Transformers 2, aka Transformers Revenge of the Fallen? Well, it's the vengeful robot above, but let's listen to Shia Labeouf who plays the role of Sam Witwicky, he'll give more details:

"Basically, the Fallen is to them [Transformers and Decepticons] what cavemen, Neanderthals were to us. He's the ancestor, the first version of this exoskeleton. He's the first version of this sentient being. That's what he is. He's the origins of what they came from."

Shia Labeouf

The Fallen is ancient but is no oldies: fear the wrath of the fallen! fear his revenge!
:)