Kabuto has resurrected the corpses of deceased jinchuriki (specifically – the 4th Mizukage, Rōshi – 4-tails, Han – 5-tails, Utakata – 6-tails, Fū – 7-tails) and is using a modified version of the Impure World Reincarnation (Edo Tensei) to control them. He also holds a young boy named Muku captive. Muku is a special clone-like creation designed to host a massive amount of chakra.
“You… you’re a jinchuriki who wasn’t broken.” naruto episode 385
The Edo jinchuriki, now partially freed from Kabuto’s control, make a collective decision. They turn to face Muku. Kabuto has resurrected the corpses of deceased jinchuriki