The Dee Dee Twins are the two twin sisters Delia and Deidre Dennis who were the granddaughters of Harley Quinn. They joined the Jokerz gang under the joint alias "Dee Dee" and later followed in their grandmother's footsteps as "hench-wenches" of the original Joker. They are the secondary antagonists of Batman Beyond: Return of the Joker. They were both voiced by Melissa Joan Hart.