Yeah, outside of Avatar, I can only think of two other cartoons that actually had a (good) story to tell.
Reboot - This was on the original Toonami. It starts off episodic (like many other action cartoons), but later on it gets a coherent plot, and I really enjoyed it (at least as a kid, it's been years since I've seen it). Lots of good memories watching this & DBZ back to back.
Gargoyles - This was a 90's show, but I didn't get into it until a couple years ago (late night on Disney XD). The animation was wonderful, the story is interesting, and it could get surprisingly dark for a Disney property (always thought it would make a great addition to Kingdom Hearts).


