Star Wars: The Force Unleashed (Rule Of Two Broken)
By William on Friday, July 13th, 2007 at 11:05 AM PST In Microsoft

The Force Unleashed is probably the one game I am looking the most forward to. I do have some serious questions about the story though. First off, what happened to the “Rule of Two?” In the Force Unleashed you are playing as Darth Vader’s apprentice. Considering this game takes place between Episode III and IV, Vader is still an apprentice himself, meaning you will be playing as the apprentice’s apprentice. I really hope they explain this deviation from sith rules that have been followed in every story before. The only thing I could imagine is that possibly Vader was secretly training someone to help him kill Emperor Palpatine, but who really knows.
- “Always two there are; no more, no less: a master and an apprentice.” -Yoda
- “Two there should be; no more, no less. One to embody power, the other to crave it.” -Darth Bane
The Rule of Two is a principle in the fictional Star Wars universe used to describe the Sith practice of allowing only two Sith Lords to exist at a time: a Master and an apprentice.

in the clone wars palpatine gave dooku permission to have an apprentice in Asajj Ventress.
“The only thing I could imagine is that possibly Vader was secretly training someone to help him kill Emperor Palpatine.”
Bingo! This precedent was seen at least twice in the films: Once when Count Dooku tries to entice Obi-Wan into joining him to overthrow the Emperor, and once when Vader does the same thing with Luke. The Force Unleashed is the first revelation that perhaps Luke wasn’t the first person Vader tried to find to help him overthrow the Emperor. (Of course, we know this “new” apprentice doesn’t succeed, which begs the question: “what happens him?” Either he ends up being killed, or perhaps he switches to the Light side of the Force at some point?)
http://starwars.wikia.com/wiki/Shadow_Hand
basically, there’s a padawan to the sith lord. (not the same idea but still).
There’s always another waiting to take over when the #1 is overthrown. Only two are Sith, but the way of the Sith basically is that if you’re the head guy you can expect to be tossed out at some point by your #2 who has his #3 waiting to kill him, etc etc. Vader was just pretty shitty about finding a successor.
The ‘rule of two’ has never been strictly adhered to by the Sith throughout the Star Wars universe. Not just in the movies, but the books as well.