The spy is revealed to be Kabuto Yakushi . He explains that he was under Sasori's sleeper-agent jutsu but was freed by Orochimaru.
The primary focus of , titled "The Tenchi Bridge," is the long-awaited confrontation between Team Kakashi and Sasori's secret spy. Episode Overview Naruto Shippuden Episode 39
Long-Awaited Reunion (also known as the Tenchi Bridge Reconnaissance Mission ) Canon Status: Manga Canon (adapts chapters 289–291) Key Plot Points The spy is revealed to be Kabuto Yakushi