Darth Galvatron

Darth Galvatron was the reborn form of former Decepticon leader Darth Megatron, as while they are the same being, Darth Galavatrons creation changed Megatrons Mind, making him more evil than his prior self. In his heart, he still loved his dead lover Starscream.

Rebirth
Darth Megatron battled a final duel to try and kill his brother and rival, Optimus Prime. Prime won and Darth Megatron fell into the Cybertron incinirator.

However, this was not the end. Zarack, a headmaster found the body.