After a mysterious school opens across the street, the students of Super Hero High find themselves up against a new threat. Now, Wonder Woman, Supergirl, Batgirl and the rest of the DC Super Hero Girls not only have to worry about the well-being of their grades, but the safety and security of friends, family and the rest of civilization. The girls must figure out how to put a stop to this evil, new cross-town rival and save the world once again

When Supergirl, Wonder Woman, Batgirl, Bumblebee and Katana suddenly realize they cannot remember a single moment from their Monday at Super Hero High, the young DC Super Heroes spring into sleuthing action! Suspecting foul-play, they band together to retrace their steps and uncover the mystery of who exactly stole their memories – and what nefarious plan might be afoot?

With help from a local fisherman, his niece and an adorable baby seal, George embarks on a quest in search of the long-lost shipwreck of legendary sea captain Trumpet Tooter.