The Secret Origin of the Ultimate Tag Team!!

is episode 282 of the Naruto: Shippūden anime.

Summary
The two jinchūriki's progress to the battlefield is barred by A and Tsunade. Despite Naruto's attempts to press on, the Raikage proves able to keep up with Naruto even while in the Nine-Tails Chakra Mode. Tsunade, who noted that it was actually the opposite — a miracle that Naruto could keep up with the shinobi who held the title as the fastest person alive since the death of Konoha's Yellow Flash also stated that though she was the Hokage, she could not act independent of the Allied Shinobi Forces. Shocked when A declares that he would kill both Naruto and B, if it came down to it, but resolved to kill Naruto at that moment because B, being a perfect jinchūriki, held greater military worth than Naruto. As A moved in to attack Naruto once again, his punch is deflected by B who had transformed his arm into that of the Eight-Tails. First-bumping his brother afterwards, the two remember the story that led up to B becoming A's brother, the many missions they went on, the advice given to A by B's cousin, his subsequent death and B becoming the new jinchūriki of the Eight-Tails, and their encounter with the then thought to be Saviour of this World: Minato Namikaze and the words he imparted to them.