What is "galvatron"

Galvatron is a name adopted by several fictional characters in the Transformers franchise. He is usually the recreated form of Megatron, the Decepticon leader; however, it has been used for separate and unrelated characters, most notably the main villain of the anime series Beast Wars II (who was not a former Megatron, but instead an unrelated Predacon), and the character from the more recent IDW Publishing G1 series (in which he was an ancient Cybertronian from the Dead Universe).