Emperor Palpatine ( Ian McDiarmid ) and Darth Vader ( David Prowse\/James Earl Jones ) send the Rebels false information that the station 's weapons systems are not operational in order to lure them into a trap , and bring Luke on board to turn him to the dark side of the Force .
Emperor Palpatine ( Ian McDiarmid ) and Darth Vader ( David Prowse\/James Earl Jones ) send the Rebels false information .