JLA ADVENTURES: TRAPPED IN TIME
(2014)

Super-heroes-in-training Dawnstar and Karate Kid help the Justice League defeat the Time Trapper. Karate Kid discovers that the Trapper is composed entirely of dark matter and figures that only Dawnstar's "light-based" powers can defeat the villain. Once this is done, the Justice League thanks the young heroes and offers them the opportunity to stay, but they decline, stating they must return to their time.