Martial arts with quest to save the world, yadda yadda, redeemed by excellent writing and not-stupid villainy. If you haven’t watched it yet, watch it: it’s insanely too good for Nickelodeon, and possibly animated television in general. It’s on Netflix, but if you feel like buying it, here’s the link. Note: I haven’t seen the live-action version, and I’ve been told by pretty much anybody not to rectify that.
