I’m too lazy to explain who they are… here, have a link: http://starwars.wikia.com/wiki/X1 http://starwars.wikia.com/wiki/X2… Sorry, X1 turns into a bad guy, and he is the one who looks more boss. So basically they are force sensitive clones, (cloned from a jedi) who were strong. Order 66 came… X1 followed, after X2 killed a jedi, he turned into a rebel. After the 2nd death star explosion, X1 planned to make a brand new empire with him as the leader… and eventually turned into a sith, X2 turned into a jedi. And X2 killed X1, happily ever after!