Claim: Darth Vader serves as the right hand of a character mainly portrayed by Ian McDiarmid.
Evidence: 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 -LRB- also known as Darth Sidious -RRB-.
Sheev Palpatine -LRB- also known as Darth Sidious or simply The Emperor -RRB- is a fictional character of the Star Wars franchise , mainly portrayed by Ian McDiarmid.