Naruto Shippuden Episode 66 -

Team Asuma encounters a horde of reanimated corpses from the Kohaku Clan, which were stolen from their graves to attack the village.

Asuma Sarutobi is forced to confront the reanimated bodies of four of his former comrades from the Twelve Guardian Ninja : Kitane, Nauma, Tōu, and Seito. Unlike other pawns, these four retain their original personalities and abilities. Naruto Shippuden Episode 66

Naruto and Naruto Shippuden filler list: The episodes you can miss Team Asuma encounters a horde of reanimated corpses

While the village is under siege, Naruto tracks down Sora . He questions Sora's motives for siding with Furido (the antagonist) and attempting to assassinate the Fifth Hokage, Tsunade. Significance of the Episode Naruto and Naruto Shippuden filler list: The episodes

This episode is part of the first major filler arc in Shippuden . While not in the original manga, it provides deep backstory for Asuma Sarutobi and his past with the elite Guardian Twelve.