The Fallen

History
Megatronus was one of the Thirteen Primes. He was a Cybertronian of light. But when being out with the Knights of Cybertron, Megatronus was taken by Unicron. Unicron made Megatronus betray the ones he earlier called brothers. The Knights of Cybertron who were with him became Terrorcons as he returned to Cybertron.

Being back, Megatronus attacked Solus Prime as he wanted the Forge of Solus Prime. His idea was to take the Matrix, the All Spark and the Star Saber to later put them together into a superweapon. Solus refused to give the hammer to Megatronus which resulted in him killing her.

After this, Megatronus kept on his quest to destroy the last Primes. He even took Unicron to Cybertron. Prima led the other Primes to kill Megatronus. The battle was long and hard, but in the end, Prima used the Matrix to shoot Unicron into space. Megatronus was on Unicron when this happened and he disappeared as well.

Megatronus survived this though, but he was frozen into a wall inside of Unicron. He wasn't found in years. But when Nemesis Prime got to Unicron, he saw and talked to Megatronus who was now known as The Fallen. Megatronus was offline and couldn't answer, but Nemesis Prime talked hoping the lost Prime could hear him.

It is unknown if The Fallen ever will get out of Unicron. He hadn't as the Autobots and Decepticons got to Earth.