King Arthur and the Knights of Justice
Oh how I loved this series as a kid. Okay, maybe not the series per se, but that bitchin' theme song. Yes, I just used the term "bitchin" and yes, this is a perfectly apt time to use it. The song starts off with Merlin explaining in about 3 seconds the entire plot of the series, and then the killer guitar riff starts up. All the best cartoons can be summed up in 3 seconds. For example:
King Arthur and the Knights of Justice: "From the field of the future, they come to save the kingdom of the past." Done.
Transformers: Giant robots transform into vehicles and shoot each other.
Pinky and the Brain: One is a genius, the other's insane, together they try to take over the world.
Coyote and Roadrunner: Coyote tries to catch Roadrunner.
See? It works! Try explaining something like Yu-Gi-Oh! in 3 seconds and see what happens. Can't do it. Because Yu-Gi-Oh sucks. I'm onto something with this 3 second theory. Anyways, King Arthur and the Knights of Jsutice, come for the amazing introduction, stay for the way cartoons used to be. None of this anime in everything crap, just classic saturday morning cartoon.