I really liked this one. The plot just really worked for me -- how Yamiror made the Rangers sick and Kevin had to retrieve the Swordfish Zord to save them. Yeah, the fisherman was kinda random (Kevin could've told him he was a Ranger), but I'm used to this sorta thing on PR.
I love when our heros get beaten badly and demorph in battle. Saban's doing a great job of having the Rangers dirty and not always remain clean cut like before.
5/5. I don't think there'll be many focus episodes that I'll like more than this.
Also check out episode 5 of my podcast, talking about some early thoughts of Power Rangers Samurai, "THE TEAM UNITES" and "DEAL WITH A NIGHLOK."