Gaffer Tape said: Apparently The Force Unleashed's plot has to do with another of Vader's wacky attempts to dethrone the Emperor, but I've never played it, nor do I intend to, so who cares?

Actually that one is subverted in the game, quite refreshingly. The main character is like Maul, he's trained as a child to an adult as an apprentice for Vader. Vader tells him he's to make contact with the newly begun rebellion, and help him overthrow the Emperor, but when it comes down to the deed, Vader attacks him (the main character) instead, and dumps him in space. Turns out the whole thing was a plan by both Vader and the Emperor to draw out the rebel leaders and get rid of them, using the main character as perfect bait.

Or at least that's the first two acts of the story, I don't know what happens in the third (pretty sure you come back to rescue the rebels and the like)