Naruto Shippuden 424 see’s Naruto and Sasuke vs Madara go at it as it’s described to be the final battle between good and evil. Naruto and Sasuke go up against the evil that is Madara Uchiha in an effort to defeat him and the power he has. The real question is if Madara can obtain his Rinnegan from Obito and be able to fight fully against Naruto and Sasuke.
Naruto Shippuden 422 begins a two-part filler special where we follow the story of Konohamaru as he develops his own type of Rasengan from scratch and uses it against Pain. Naruto goes in and out of missions while Konohamaru directly concentrates on developing his Rasengan while using his sexy jutsu.
Naruto Shippuden 423 is a filler episode concentrating on Naruto and Konohamaru during the time when Naruto was training in order to defeat Pain and the Akatsuki. While we mainly concentrate on Konohamaru and his training towards building up his Rasengan, we also see how he’s progressed and grown up to become Naruto’s rival.