Starscream

Starscream is a cynical yet treacherous Megatron's second in command of the Decepticon and also part of Organization's Heavy Assault Force.

Canon bio
Starscream was an Air Commander of the Energon Seekers, Cybertron's finest air warriors. His dream was to recover the Matrix of Leadership and become the Prime that would return the Transformers to the Golden Age, and he saw opportunity with the rebel upstart Megatron. A patient and polite schemer, Starscream used to wish Megatron would drop the heroic anti-caste charade and be more honest about his lust for power.

These days, he alternatively wishes Megatron would stop being obsessed with his lust for power and chafes under having to work for such a madman. While he serves as Megatron's right-hand man, he constantly looks for a way to become the commander himself and Megatron knows it: Starscream's extremely volatile personality means he is not adept at hiding his true intent. Fortunately for Megatron, Starscream is prone to panic, cowardice and bombastic gestures, meaning that it'd take exceptional circumstances for Starscream to actually manage to get behind him to shove the knife in.

He may be a scientist, but we're not quite sure.