Naruto Episode 181: Hoshikage: The Buried Truth.
Episode 181 of 220 of Naruto, aired April 19, 2006, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Naruto has been rescued by the mysterious woman and soon learns who she really is. Can the two of them continue the mission the was started so very long ago and what will Subaru think when he discovers the truth?