"The Forbidden Visual Jutsu" (禁じられた瞳術, Kinjirareta Dōjutsu) is episode 210 of the Naruto: Shippūden anime.
Danzō figures out Itachi was an illusion of Sasuke's genjutsu. An enraged Sasuke completes his Susanoo and fires an arrow at Danzō, but Danzō deflects the arrow using his Wood Release. Tobi realises that Danzō collaborated with Orochimaru at some point to get the First Hokage's cells in order for Danzō to use Izanagi. Karin notices with her sensory skills that he has a technique to make him invincible and that as he uses it his Sharingan close. Danzō's attacks however do little to no damage against Sasuke's Susanoo. Danzō summons his Baku to help him out, but it is defeated by Sasuke's fireball. As the battle drags on, the eyes on Danzō's right arm close one at a time. Sasuke forms a chakra blade while Danzō creates a wind weapon with his kunai. They then strike one another simultaneously.