"Revenge of the Shadow Clones" (影の逆襲, Kage no Gyakushū) is episode 230 of the Naruto: Shippūden anime.
After having braved a storm, four of Naruto's shadow clones rebel against Naruto, taking him hostage, take control over the ship and force the crew to stop on an island. Naruto's clones were going to kill him, but he wakes up and realises it was all just a dream of one of his clones. It was caused when a shadow clone was released, after saving Naruto from a falling rope pulley, and its memories returned to the real Naruto. Naruto then realises the worth of his clones and releases them.