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Untitled (無題, Mudai) is episode 37 of the Naruto: Shippūden anime.

Synopsis

Sakura sees Sai drawing by a river and finds out that he has artistic talent, but has never given titles to anything he ever drew. Naruto and Sakura begin to realise the reason behind Sai's repulsive personality. After the hot springs, the team heads off to the Tenchi Bridge to meet with Sasori's spy. Yamato, being suspicious of traps, suggests to the team to alter their route and go through a forest. Camping for the night, Yamato then creates a two story house by again using his Wood Release technique. Inside the house, the team formulates their plan of capturing the spy.