Darth Vader serves as the right hand of a character mainly portrayed by Ian McKellen.
Darth Vader . Originally a Jedi prophesied to bring balance to the Force , he falls to the dark side of the Force and serves the evil Galactic Empire at the right hand of his Sith master , Emperor Palpatine ( also known as Darth Sidious ) . Sheev Palpatine ( also known as Darth Sidious or simply The Emperor ) is a fictional character of the Star Wars franchise , mainly portrayed by Ian McDiarmid .