The Ultimate Guide made by Dorling Kindersley will help us explain the birth of The Fallen. Some say that his birth should be attributed to the appearances he had in the comic books.
The robot which will turn out to be The Fallen is one of the Transformers that Primus produced. This robot is disloyal to Primus. He became an ally of the evil twin of Primus, Unicron. Unicron is known to be a robot which eats planets, especially the Earth. Sorry to say but Unicron together with his ally Fallen, literally fell in the battle. They lost in the battle with Primus. Consequently, they were dumped in a black hole. This black hole brought them to another area no one knows. Yes, Unicron and the Fallen were both dumped but they did suffer different fates. Unicron came into existence in the other universe while the unlucky Fallen found himself shut in among the dimensions. This area is called the Underspace.
The War Within - the Dark Ages which is the next issue of the Transformers lead the way to the comeback of the Fallen. Yes, the Fallen was sandwiched into dimensions but through the Cybertron’s space transport system and its experimental testing, The Fallen was out of his imprisonment. Because of this incident, he became an ally of Cybertron. The Chaos Trinity was also taken on by the Fallen. He also took on some of the Decepticons. Bugly, Bludgeon, and Mindwipe were those who were recruited.
The Fallen seized the following Transformers: Hot Spot, Jetfire, Grimlock, and Blitzwing. He kidnapped them to use as powers to stir Primus. The Fallen did this to make his master Unicron ready to act. This was also done by the Fallen to trigger the resentment of Unicron against its twin Primus. On the other hand, these plans did not come to reality because the collective assail of the Decepticons and the Autobots interfered in the plan. This said show of violence was led by the leaders Prowl and Shock.
As a sequel to the Transformers 2007, The Fallen will appear on the 2009 sequel of the movie. Recently made available toy box of ROTF has the following description of him: “For millennia, he has waited. Thousands of years have dragged by as he recruited proxies, one by one, to scour the cosmos for the artifact he required. Now he finds he must return to the primitive, flesh-slug infected planet on which his quest began. Nothing will stand in his way this time. If need be, he will scour the surface of this disgusting world clean in the fire of his rage, and search through the blasted rubble for that which he seeks.”
The Fallen concept art images are available @ Download page.