Code Lyoko (2003)

Episode Overview

While exploring the concept of NanoDoctors—tiny robots designed to heal diseases—Ulrich is accidentally pranked by Od, who shoves some of the gel meant for the NanoDoctors into his face. Shortly after, Ulrich faints and experiences sudden memory loss. Alarmingly, this amnesia begins to spread throughout the school, leading Jeremy and Od to suspect Xana is behind it. Meanwhile, Yumi and Od get virtualized, while Ulrich tries to escape Sissy, who is insisting they're in love. Once virtualized, Ulrich learns combat skills from Od, and together they assist Aileta in deactivating the tower. They discover that Xana's Nano-Virii had contaminated the gel habitat, affecting Ulrich.