Reyna Mary Grayson, Gotham's princess. AKA: Robin the Girl Wonder. Currently not living with Batman, she lives with a foster family. And has been fighting tooth and nail to find who was responsible for her current situation.
In which Bruce Wayne calls upon the Young Justice team to save his seven children who were kidnapped by a group of rogues who are threatening to kill one every six hours unless their demands are met.
((In this, Stephanie and Barbara were also adopted by Bruce, making all of the Bats Bruce's kids.))