Megatron

Megatron was the evil ruler of the decepticons who would stop at nothing to destroy Optimus Prime and the autobots during the last battle in transformers prime Bumbebee snuffed Megatron's spark. during the events of Predacons Rising, Megatron awoke in Unicron's anti spark and his body now deep underwater was posesed by Unicron and prime returned from retreving the allspark and was able to contain unicron and Megatron decided he was through with the decepticon cause. He is mentioned by Smockscreen when Smokescreen thought Megatron was back with new goons however this is untrue.