Megatron

MEGATRON: Megatron was the merciless leader of the evil Decepticons and one of the most feared and powerful warriors to ever emerge from Cybertron. After witnessing Bumblebee's horrific murder at the hands of the savage Shockwave, Megatron forsook his leadership of the Decepticons. Now an Autobot, Megatron wears Bumblebee's badge to carry on his legacy, becoming a force for good.