In the previous episode:
"Naruto, Sakura and Sasuke are fighting together again. They summoned their own animals, and all the ninja alliance is going to fight Madara"
The 3rd revived Hokage looks at them like their old students: the sannin trio.
Sakura summoned Katsuyu, who goes around healing people.
Naruto did his "ultra rasengan"
Sasuke did his "ultra susanoo"
And both combine their attacks to defeat the big monster of Madara.
Everybody cheerS up on them!
Kiba: Let's go!
Shino: Do it!
Hinata: Do your best!
Shikamaru: Aim right!
Chouji: You can do it!
Ino: Finish him!
Meanwhile, in another random place of the battlefield:
Tsunade is almost dead although katsuyu is with her.
Orochimaru team arrives to help her.
Tsunade recovers with Karin power. She is confused because she doesn't understand why Orochimaru is helping Konoha since he betrayed them (I dunno understand either LOL)
Flashbacks of Tsunade Orochimaru and Jiraiya past.
They were on war almost trapped there cause the enemy was around. So Orochimaru told Tsunade to runaway with him and left Jiraiya behind (HOW CAN YOU DO THIS TO JIRAIYA). Tsunade refuses and keeps on healing him.
Orochimaru decided that the best option is killing Jiraya before the three of them get killed or smashed by the cave.
Reinforces arrived but Orochimaru is holding his kunai in order to attack. Tsunade put herself in the middle of them.
Jiraiya is making a Victory pose meaning everything is fine.
Tsunade is still blocking Orochimaru's way, just in case.
Finally Tsunade asks Katsuyu to inform her, so she decided to go to battlefield.
NEXT WEEK, NEW EPISODE!