Naruto Shippuden: Ultimate Ninja Storm 2 Hints for Xbox 360
Also on: PlayStation 3
Complete the task of getting all of the Curse Dolls. Once you've defeated the "Ultimate Ninja" an alternate storyline will be unlocked where you'll fight as Sasuke to bring in the Eight-Tailed Jinchuriki, Killer Bee. Once you complete it you'll get an achievement and unlock both characters.