Big Adventure! The Quest for the Fourth Hokage's Legacy Part 1

is episode 170 of the Naruto: Shippuden anime.

Synopsis
The story goes back to right before the start of the final rounds of the Chunin Exam. As Naruto trains in preparation for his upcoming match, he hears Jiraiya speak of “the Fourth Hokage’s legacy.”

Trivia

 * This episode has no omake.