Avatar: The Last Airbender

Teens and adults who think a cartoon is beneath them should give this one a try, because the war is serious and the jokes still land. Aang yells "Yip yip!" every time he takes off on Appa, and Sokka waves off Katara's waterbending with a sarcastic remark that starts a sibling squabble. Zuko keeps turning up in pursuit, and the jokes keep the chase light.

The first ten or so episodes are light and mostly self-contained; from the back half of season one, the story runs continuously.