Shockwave (Transformers)

Shockwave is a Decepticon from the Transformers Franchise. He is usually treated as the "mad scientist" of the Decepticons. In some continuties he is Megatron's true second in command but is forced to stay on Cybertron leaving Starscream as the acting Second in Command. Although he appears loyal to Megatron, his true loyalty lies in logic and would overthrow Megatron without hesitation if that is the logical choice

Shockwave was advertised as the main antagonist in Transformers: Dark of the Moon but this was part of a misinformation campaign to hide the true villain of the film.