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Emperor Palpatine's sociopathic glee ("Episode VI")
Darth Vader may be imposing in his shiny black armor, but his leader Palpatine (played by Ian McDiarmid) is more diabolically fearsome with his pale white skin, yellow eyes and rotting, Mephistophelian grin. His look of unfettered glee as he tortures Luke in "Return of the Jedi" is truly chilling.