Naruto: Episode 173

During an attack by a renegade ninja, Nagato reflexively uses his Rinnegan to save Yahiko. Seeing this, Jiraiya begins to believe Nagato is the "Child of Prophecy" and the reincarnation of the Sage of Six Paths .

This is a filler episode from the "Land of Sea" arc. Naruto Episode 173

Konohamaru and Mugino disguise themselves to infiltrate Victor’s company in the Land of Valleys. During an attack by a renegade ninja, Nagato

They discover a God Tree sapling being grown illegally, which Victor plans to use as a source of power by feeding it humans. This "second great pain" transformed Nagato into Pain,

The episode details the betrayal by Hanzo of the Salamander and Danzo Shimura , which led to Yahiko's self-sacrifice. This "second great pain" transformed Nagato into Pain, leading him to believe true peace can only be achieved through shared suffering.

In the Boruto sequel series, this episode occurs during the "Kara Actuation" arc.