Megatron (Unicron Trilogy)

Megatron is the main antagonist of the three series of the Unicron trilogy.

Armada
Megatron led the Decepticons in civil war, which was only bolstered due to the Mini-Cons. The Mini-Cons made a pact with the Autobots to leave the planet in a starship, but Megatron struck as the tiny 'bots were leaving, and the damaged Mini-Con ship crash-landed on the planet Earth. In one battle among the many that followed, Megatron discovered the abandoned Autobot Wheeljack pinned by rubble in the midst of an inferno, and saved his life in exchange for his loyalty. In 2010, Megatron move from Cybertron to Earth in his goal to seize the power of the Minicons. His relationship with his lieutenant Starscream was a troubled one, his harsh abuse of the younger Decepticon earning him his undying enmity, while his rivalry with Optimus Prime was an odder one still: when the Autobot leader was thought dead, Megatron sank into a deep depression, seeing no further challenge in his life without his eternal foe. Once upgraded through the power of the Mini-Cons into "Galvatron", Megatron was tormented further by the emergence of the threat of Unicron, whose existence called into question all he had ever fought for. Unable to tolerate the idea of living in peace, Megatron sacrificed his life to destroy Unicron.

Energon
But Megatron did not die, living on within Unicron, absorbed into the chaos-bringer's body. Ten years later, when the alien Alpha Q began his plan to restore Unicron with Energon, Megatron was able to siphon some off for his own and create a new body for himself. Returned to life, he promptly took over Alpha Q's objective, raiding the Autobots' cities on Earth for Energon to resurrect Unicron as the ultimate weapon. But Unicron's power was too much for Megatron to handle, and he became possessed by the dark god, transformed into Galvatron once again-through exposure to Super Energon-and mutated into a planet-sized titan. Refusing to be a servant, Megatron shook off Unicron's control long enough to hurl himself into an Energon sun created by Primus, once again appearing to give up his life rather than let Unicron win.

Cybertron
A further ten years later, when the energon sun collapsed into a black hole, Megatron was freed, having transformed Unicron's remains into a suit of armor that greatly magnified his already-impressive power. Megatron began a search for the Cyber Planet Keys, seeking to use them to accelerate the universal degradation caused by the black hole and remake creation in his own image. After being upgraded to Galvatron for a third time by the power of Gigantion's Cyber Planet Key, Megatron succeeded in stealing the keys from the Autobots, but was defeated in battle within the singularity. With ultimate power lost to him, and being taunted by Starscream from across the dimensions, Megatron challenged Optimus Prime to one final battle on Cybertron's moon, which concluded when Prime ran him through with Vector Prime's sword, disintegrating his body and finally putting an end to him. In the hereafter, Galvatron was seen eternally duelling Vector Prime.