InuYasha Episode 54: The Backlash Wave: Tetsusaiga`s Ultimate Technique
Episode 54 of 167 of InuYasha, aired December 10, 2001, 24 minutes. Available with English subtitles and dub where released.
Episode summary
Inuyasha fights Ryukotsusei with Tetsusaiga's ultimate attack: The Backlash Wave!