Emperor Palpatine

Emperor Palpatine was the main villain of the Star Wars movies. In the original trilogy, he did not appear until the final film, Return of the Jedi. There he ordered Darth Vader to capture Luke Skywalker. After Luke defeated Vader in a duel, Palpatine encouraged him to kill Vader and become his new apprentice. When Luke refused, the enraged Emperor attacked Luke with Force Lightning, causing him horrible pain. Vader could not stand to see his son in so much pain so he grabbed the Emperor from behind and hurled him down to his death at the bottom of the main reactor shaft. Unfortunately the wild lightning coming from the Emperor's hands while Vader carried him eventually proved fatal to Vader.