Recently, we saw the end of the battle between Madara vs Guy in the latest Naruto Shippuden 421, on top of this we saw a number of other extra bits where Hagoromo met with Sasuke and Naruto in their own consciousness and gave both of them power. In turn, this allowed for Naruto to save Guy and allow for a whole new battle to begin: Naruto and Sasuke vs Madara Uchiha!