David Prowse: Darth Vader
Darth Vader : [as Obi-Wan finds him and ignites lightsaber] I've been waiting for you, Obi-Wan. We meet again, at last. The circle is now complete. When I left you I was but the learner, but now I am the master.
Ben Obi-Wan Kenobi : Only a master of evil, Darth.
Darth Vader : Your powers are weak, old man.
Ben Obi-Wan Kenobi : You can't win, Darth. If you strike me down I will become more powerful than you could possibly imagine.
Darth Vader : You should not have come back.
Luke : [Obi-Wan spots him and allows himself to be killed] NO!
[stormtroopers shoot at him]