Final arc: The Return of the Senju
Main villain: Hashirama
Side villains: Orochimaru and Tobirama
Plot: Orochimaru, finally getting his power back from the death reaper seal, manages to accidentally set the trapped hokage free!
Hashirama feels genetically violated and together with his brother Tobirama sets out to bring vengeance to the world, beginning with Orochimaru who is instantly killed, paling to the power of the mighty Senju.
Minato, also uberly pissed due to being locked up in a shinigami for a long period, wanting to join the crusade of the violated Hokage and his loyal bro, is eventually calmed down by the extremely tolerant Hiruzen who injects his sarutobi patience genes in Minato.
It's a desperate situation for Naruto and the good guys. He has marched out to face the Senju brothers after the world has been terrorized for weeks, together with his friends.
"I'm the new hokagebayo"
Hashi: "Bwahahaha! A little brat like you talking big to someone like me!? Did you know I beat Madara and made Uchiha my bitches using only sticks? What are you gonna do, Rasengan my balls? Speaking of which.. - (Giant plot twist about to be revealed regarding the true origins of the rasengan, but Naruto interrupts)
Naruto: "Heh. You think you're so good, but you're forgetting something - I have the will of fire!"
Hashi enrages and becomes furious, rushing towards Naruto: "I INVENTED THE WILL OF FIRE!!"
Naruto thinking: "Everything going according to plan"
Naruto loads a rasengan, about to clash with the insane Hashirama, but in the last second he stops the rasengan (Minato vs Tobi flashback scene where Minato tricks Tobi is shown for a short while) and takes out a needle that he injects in Hashirama
Naruto:" I just injected you with Konohamaru's Sarutobi genes. Do you think I spent this entire time playing tag with Sasuke? I did my research and concluded this was the only way to defeat you! I'm not stupid anymore!"
Shikamaru, also present, thinking: "Actually it was my idea.. He keeps claiming my ideas as his own ever since he became Hokage.. How troublesome"
Hashi: "Who the f is Konohamaru!? By the way, I'm starting to calm down now, I think.. Come Tobirama, let's go eat some ramen."
But just as things are settling down, Orochimaru arrives. If you wondered where Minato and Hiruzen were, Orochimaru had fooled death again and absorbed Minato and Hiruzen's powers.
The rest folds out so that Orochimaru talks about how he is immune to the Sarutobi gene, Oro absorbing the Senju brothers, later Oro is defeated by Naruto and Sasuke, the souls of the hokage can finally rest etc.
Oh, final scene you see Naruto reading the True Story about Rasengan - by Hashirama and getting disgusted by the truth while eating some ramen. The end
And on topic, yes
