Ashi cut loose with her bad self and kicked ass doing it
The Daughters of Aku made great villains for the early episodes because they physically and psychologically threatened Jack despite the fact that we know he needs to make it to a final showdown with Aku. We always knew Ashi was the most compelling and dangerous of the bunch, but this episode turned her into something more.
We got in her head, where she told her brainwashing to go screw itself. We saw Jack tell her she was a lost cause, to which she told him to go screw himself and teach her anyway. We saw her response to the takeover of children's minds for use as weapons, and she fought through capture and electrocution to save them.
Between her and the Scotsman's legion of warrior-women daughters, Samurai Jack '17 clearly wants more tries at the Bechdel test this season than it ever did in the mid-00s, but patriarchy still runs the show. The old-school Scotsman yelled at his daughters to "cover up" before a battle, and it's only funny because we know he's a protective maniac. Jack himself sounds more than a little patronizing when he speaks to Ashi and Internet reactions to her bondage situation last week didn't help matters.