Galvatron was once Megatron, but was reborn from his death throes in a Faustian pact with Unicron. He retains the memories and spark of Megatron, but his personality was significantly altered after the near-death experience, massive physical upgrade, and reprogramming; just ask Starscream about the difference. And all that was before he went insane. The cause and extent of Galvatron's madness varies between different timelines, as does his physical power. Sometimes he's all but invincible.
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