Sheev Palpatine

Sheev Palpatine, largely known in the Star Wars Galaxy and beyond as simply "The Emperor" or "Darth Sidious", was a primary antagonist in When Universes Collide, up to Season Four, when his attempted coup against the Decepticon Megatronus failed. As punishment for his treachery, Megatronus banished Palpatine via a magic spell and reverted his age, leaving the cruel and vile Sith's fate unknown.