During my last watching of the OT I got to thinking about Vader and how he brought Luke before the Emperor in ROTJ. I'm not entirely sure what his goal and desired outcome was. In TESB Vader asks Luke to join him so that together they could overthrow the Emperor. Did Vader want: - Luke to turn to the dark side and join him and the Emperor? - Luke to destroy the Emperor (either with or without Vader's help)? - Vader to destroy Luke if he refused to turn? We all know what ended up happening, but I don't think that was what Vader had planned. What was Vader's goal and motivation for bringing Luke before the Emperor and what did he want to happen?