Anime Episode Title: Bleach Episode 170 English Dubbed

Title: Desperate Struggle Under The Moonlit Night, The Mysterious Assassin and Zanpakuto
Dubbed By: Viz Media, LLC

Plot Summary:
Lurichiyo`s group is attacked in the middle of the night by an assasin and it`s up to Ichigo to defeat him. After the death of the assasin everyone is told that Lurichiyo is the heir to one of The Four Noble Houses. That is why Komui, the one that is trying to take over Lurichiyo`s clan, is sending his best assasin`s after them.

Direct Link – http://www.animeratio.com/anime/bleach/episode-170-english-dubbed/