InuYasha Episode 18: Naraku and Sesshomaru Join Forces
Episode 18 of 167 of InuYasha, aired March 5, 2001, 24 minutes. Available with English subtitles and dub where released.
Episode summary
The one-armed Sesshomaru receives a Shikon-enhanced arm with which to wield Tetsusaiga from a mysterious man, wearing a baboon cloak, named Naraku. This leads Sesshomaru to go after Inuyasha, once more.