Heir to Darkness

is episode 148 of the Naruto: Shippuden anime.

Synopsis
After returning to Mount Katsurugi, Tonbee, Hotaru, and Team 7 planned their next move. Tonbee explained the clan's history and En no Gyoja's dream. Tonbee also said that if Shiranami comes back that the clan will be restored. Naruto Uzumaki went to search for him. Meanwhile the others were preparing to remove the kinjutsu. At the end of the episode, the group of hunter-nin tracking Utakata were in the process of pursuing him when they were confronted by the Animal path's dog summon.

Fun facts
This ending scene has been called the most scary and well done ending of an episode in the series' history. Many fans were happy to actually see something that mattered in the storyline at all.